| 12/12/1988 | Exceptions for Specified Quantities of Radioactive Materials | HM-149F | NPRM | 53 FR 49895 |
| 11/14/1988 | Classification of Gases Which are Toxic by Inhalation | HM-181 | SNPRM | 53 FR 45868 |
| 11/10/1988 | Etiologic Agents | HM-142A | NPRM | 53 FR 45525 |
| 10/5/1988 | Highway Routing Standards for Hazardous Materials; Extension of comment period | HM-203 | ANPRM | 53 FR 39114 |
| 9/29/1988 | Editorial Corrections and Clarifications | HM-189F | FR | 53 FR 38272 |
| 9/27/1988 | Hazardous Materials Regulations; Miscellaneous Amendment | HM-189G | FR | 53 FR 37576 |
| 9/20/1988 | Modification to DOT Specification 21PF-1 Overpacks | HM-190 | FR | 53 FR 36548 |
| 9/19/1988 | Transportation of Hazardous Materials; Proposed Miscellaneous Amendments | HM-166W | NPRM | 53 FR 36410 |
| 9/15/1988 | Implementation of the International Civil Aviation Organization's Technical Instructions | HM-184E | NPRM | 53 FR 35968 |
| 5/13/1988 | Molten Sulfur | HM-198 | FR | 53 FR 17158 |
| 5/12/1988 | State Designations of Alternative Routes for Radioactive Materials Transportation | HM-164A | FR | 53 FR 16990 |
| 5/12/1988 | Notification to RSPA of Route Plans for Radioactive Materials Transportation | HM-164B | FR | 53 FR 16991 |
| 4/14/1988 | Performance-Oriented Packaging Standards; Miscellaneous Proposals; Reopening of Comment Period | HM-181 | NPRM | 53 FR 12442 |
| 4/7/1988 | Highway Routing Standards for Hazardous Materials | HM-203 | ANPRM | 53 FR 11618 |
| 4/6/1988 | Hazardous Materials; Uranium Hexafluoride | HM-166V | NPRM | 53 FR 11320 |
| 3/17/1988 | Hazardous Materials Table | HM-145F | FR | 53 FR 8846 |
| 2/18/1988 | Detection and Repair of Cracks, Pits, Corrosion, Lining, Flaws, Thermal Protection Flaws, and Other Defects of Tank Car Tanks; and Shippers; Use of Tank Car Tanks With Localized Thin Spots | HM-201; HM-201B | ANPRM | 53 FR 4862 |
| 2/12/1988 | Standards for Construction of Fireworks and Novelties; Approved for Transportation | HM-202 | NPRM | 53 FR 4348 |
| 12/8/1987 | Shippers: Use of Tank Cars with Localized Thinning Spots | HM-201B | NPRM | 52 FR 46511 |
| 12/8/1987 | Detection and Repair of Cracks, Pits, Corrosion, Lining, Flaws, Thermal Protection Flaws, and Other Defects of Tank Car Tanks | HM-201 | ANPRM | 52 FR 46510 |
| 11/6/1987 | Performance-Oriented Packaging Standards; Miscellaneous Proposals; Corrections and Supplemental Proposals | HM-181 | NPRM | 52 FR 42772 |
| 10/27/1987 | Hazardous Substances | HM-145F | FR | 52 FR 41300 |
| 9/30/1987 | Hazardous Materials; Editorial Corrections and Clarifications | HM-189E | FR | 52 FR 36670 |
| 9/21/1987 | Hazardous Materials in Interstate Commerce; Extension of Commnent Period | HM-200 | ANPRM | 52 FR 35464 |
| 9/8/1987 | Performance-Oriented Packaging Standards; Miscellaneous Proposals; Postponement of Hearing Date and Extension of Comment Period | HM-181 | NPRM | 52 FR 33906 |
| 9/4/1987 | Emergency Response Communication Standards; Extension of Comments Period and Corrections | HM-126C | NPRM | 52 FR 33611 |
| 8/20/1987 | Emergency Response Communication Standards | HM-126C | NPRM | 52 FR 31486 |
| 8/10/1987 | Bulk Packagings and Miscellaneous Amendments | HM-126D | FR | 52 FR 29526 |
| 7/16/1987 | State Designations of Alternative Routes for Radioactive Materials Transportation | HM-164A | NPRM | 52 FR 26928 |
| 7/16/1987 | Notification to RSPA of Route Plans for Radioactive Materials Transportation | HM-164B | NPRM | 52 FR 26932 |
| 7/10/1987 | DOT 3AL Aluminum Cylinder; Safety Problems | HM-176A | ANPRM | 52 FR 26027 |
| 7/6/1987 | Hazardous Materials; Uranium Hexafluoride | HM-166V | FR | 52 FR 25340 |
| 7/6/1987 | Hazardous Materials; Uranium Hexafluoride | HM-166V | NPRM | 52 FR 25342 |
| 7/1/1987 | Hazardous Substances | HM-145F | FR | 52 FR 24473 |
| 6/29/1987 | Hazardous Materials in Interstate Commerce; Advance Notice of Proposed Rulemaking | HM-200 | ANPRM | 52 FR 24195 |
| 5/20/1987 | Enforcement of Financial Responsibility | HM-199 | ANPRM | 52 FR 19116 |
| 5/5/1987 | Performance-Oriented Packaging Standards; Miscellaneous Proposals | HM-181 | NPRM | 52 FR 16482 |
| 5/1/1987 | Exceptions for Specified Quantities of Radioactive Materials | HM-149E | FR | 52 FR 15948 |
| 4/20/1987 | Transportation of Hazardous Materials; Miscellaneous Amendments | HM-166U | FR | 52 FR 13034 |
| 3/27/1987 | Detailed Hazardous Materials Incident Reports | HM-36B | NPRM | 52 FR 9996 |
| 3/19/1987 | Reportable Quantity of Hazardous Substances | HM-145E | FR | 52 FR 8590 |
| 3/12/1987 | Hazardous Materials; Uranium Hexafluoride | HM-166V | FR | 52 FR 7581 |
| 3/4/1987 | Meetings to Discuss Comments Received on Proposed Revisions to Requirements for Cargo Tanks | HM-183; HM-183A | NPRM | 52 FR 6591 |
| 3/2/1987 | Exceptions for Specified Quantities of Radioactive Materials | HM-149E | NPRM | 52 FR 6178 |
| 2/17/1987 | Hazardous Substances; Corrections | HM-145F | FR | 52 FR 4824 |
| 12/24/1986 | Hazardous Materials; Uranium Hexafluoride: Petitions for Reconsideration; Notice of Public Meeting | HM-166V | FR | 51 FR 46674 |
| 12/24/1986 | Hazardous Substances; Delay of Effective Date | HM-145F | FR | 51 FR 46672 |
| 12/12/1986 | Implementation of the ICAO Technical Instructions | HM-184D | FR | 51 FR 44790 |
| 11/21/1986 | Hazardous Substances | HM-145F | FR | 51 FR 42174 |
| 11/21/1986 | Molten Sulfur; Molten Materials Generally | HM-198 | NPRM | 51 FR 42114 |
| 11/18/1986 | Hazardous Materials; Uranium Hexafluoride | HM-166V | FR | 51 FR 41631 |
| 10/1/1986 | Editorial Corrections and Clarifications | HM-189D | FR | 51 FR 34985 |
| 9/24/1986 | Placarding Tank Cars Which Contain Hazardous Material Residue; Delay of Effective Date | HM-180 | FR | 51 FR 33900 |
| 8/18/1986 | Implementation of the ICAO Techincal Instructions | HM-184D | NPRM | 51 FR 29503 |
| 8/13/1986 | Reportable Quantity of Hazardous Substances; Extension of Comment Period | HM-145E | NPRM | 51 FR 28962 |
| 8/8/1986 | Rear Bumpers on Cargo Tank Truck | HM-183B | NPRM | 51 FR 28605 |
| 7/30/1986 | Transportation of Hazardous Materials; Proposed Miscellaneous Amendments | HM-166U | NPRM | 51 FR 27223 |
| 7/15/1986 | Transportation of Hazardous Materials; IMO Proper Shipping Name | HM-171D | FR | 51 FR 25639 |
| 6/25/1986 | Placarding of Tank Cars Which Contain Hazardous Material Residue; Disposition of Petitions for Reconsideration | HM-180 | FR | 51 FR 23075 |
| 6/25/1986 | Transportation of Hazardous Materials Between the United States and Canada; Response to Petition for Reconsideration | HM-188B | FR | 51 FR 23073 |
| 6/23/1986 | Reportable Quantity of Hazardous Substance | HM-145E | NPRM | 51 FR 22902 |
| 6/3/1986 | Transportation of Hazardous Materials; Proposed Miscellaneous Amendments | HM-166U | NPRM | 51 FR 19866 |
| 4/11/1986 | Hazardous Materials; Uranium Hexafluoride | HM-166V | NPRM | 51 FR 12529 |
| 3/17/1986 | Placarding Tank Cars Which Contain Hazardous Material Residue | HM-180 | NPRM | 51 FR 9079 |
| 2/18/1986 | Transportation of Hazardous Materials; Miscellaneous Amendments | HM-166T | FR | 51 FR 5968 |
| 2/18/1986 | Meeting on Proposed Revisions to Requirements for Cargo Tanks | HM-183; HM-183A | NPRM | 51 FR 5745 |
| 2/4/1986 | Reclassification of Special Fireworks | HM-195 | ANPRM | 51 FR 4405 |
| 2/4/1986 | Implementation of the ICAO Technical Instructions | HM-184C | FR | 51 FR 4368 |
| 1/30/1986 | Packaging and Placarding Requirements for Liquids Toxic by Inhalation | HM-196 | FR | 51 FR 3788 |
| 1/23/1986 | Requirements for Cargo Tanks; Extension of Comment Period | HM-183; HM-183A | NPRM | 51 FR 3085 |
| 12/27/1985 | Cylinder Retester Identification Procedures; Delay of Effective Date | HM-172B | FR | 50 FR 52926 |
| 12/27/1985 | Transportation of Hazardous Materials Between the United States and Canada | HM-188B | FR | 50 FR 52925 |
| 12/5/1985 | Cylinder Retester Identification Procedures | HM-172B | FR | 50 FR 49849 |
| 12/5/1985 | Requirements for Cargo Tanks; Corrections and Clarifications | HM-183; HM-183A | NPRM | 50 FR 49866 |
| 12/2/1985 | Implementation of the ICAO Techincal Instructions | HM-184C | FR | 50 FR 49393 |
| 11/25/1985 | Magnetized Material | HM-166S | FR | 50 FR 48419 |
| 11/6/1985 | Cylinder Retester Identification Procedures | HM-172B | FR | 50 FR 46054 |
| 11/6/1985 | Placarding of Empty Tank Cars; Transportation of Hazardous Materials Between Canada and the United States; Corrections | HM-180; HM-188B | FR | 50 FR 46053 |
| 10/16/1985 | Hazardous Materials; Radiation Level Limits for Exclusive Use Shipment Radioactive Materials | HM-166P | FR | 50 FR 41895 |
| 10/11/1985 | Editorial Corrections and Clarifications | HM-189C | FR | 50 FR 41521 |
| 10/11/1985 | Transportation of Hazardous Materials Between Canada and the United States | HM-188B | FR | 50 FR 41516 |
| 10/8/1985 | Packaging and Placarding Requirements for Liquids Toxic by Inhalation | HM-196 | FR | 50 FR 41092 |
| 9/26/1985 | Placarding Empty Tank Cars | HM-180 | FR | 50 FR 39005 |
| 9/17/1985 | Requirements for Cargo Tanks | HM-183; HM-183A | NPRM | 50 FR 37766 |
| 7/16/1985 | Implementation of the ICAO Techincal Instructions | HM-184C | NPRM | 50 FR 28820 |
| 6/24/1985 | Shipment of Hazardous Materials; Miscellaneous Amendments | HM-166R | FR | 50 FR 25993 |
| 6/6/1985 | Tritium and Carbon-14; Low Specific Activity Radioactive Materials Transportated for Disposal or Recovery | HM-193 | FR | 50 FR 23811 |
| 5/30/1985 | Transportation of Hazardous Materials Between Canada and the United States | HM-188B | NPRM | 50 FR 23036 |
| 5/22/1985 | Exceptions for Specified Quantities of
Radioactive Materials; Correction | HM-149D | FR | 50 FR 21051 |
| 5/2/1985 | Exceptions for Specified Quantities of Radioactive Materials | HM-149D | FR | 50 FR 18667 |
| 4/30/1985 | Shippers; Use of Cargo Tanks, Portable Tanks, IM Portable Tanks, and Multi-Unit Tank Car Tanks in TOFC and COFC Service | HM-197 | ANPRM | 50 FR 18278 |
| 4/24/1985 | Designation of Testing Agencies: United Nations Packagings; Correction | HM-194 | FR | 50 FR 16089 |
| 4/4/1985 | Conversion of Exemptions | HM-139G | FR | 50 FR 13381 |
| 3/29/1985 | Conversion of Exemptions | HM-139G | FR | 50 FR 12544 |
| 3/25/1985 | Conversion of Exemptions | HM-139G | FR | 50 FR 11700 |
| 3/19/1985 | Shipment of Hazardous Materials: iscellaneous Amendments | HM-166R | FR | 50 FR 11048 |
| 3/13/1985 | Designation of Testing Agencies; United Nations Packagings | HM-194 | FR | 50 FR 10060 |
| 3/13/1985 | Packaging and Placarding Requirements for Liquids Toxic by Inhalation; Extension of Comment Period | HM-196 | NPRM | 50 FR 10088 |
| 3/4/1985 | Coupler Vertical Restraint Systems | HM-174 | FR | 50 FR 8635 |
| 2/13/1985 | Quantity Limitations Aboard Aircraft | HM-192 | NPRM | 50 FR 6013 |
| 2/7/1985 | Packaging and Placarding Requirements for Liquids Toxic by Inhalation | HM-196 | NPRM | 50 FR 5270 |
| 1/7/1985 | Classification of Detonating Cord, and Packaging of Detonators | HM-191 | FR | 50 FR 798 |
| 1/3/1985 | Transportation of Hazardous Materials; Proposed Miscellaneous Amendments | HM-166T | NPRM | 50 FR 288 |
