Publisher
- Mississippi River Commission360
- Mississippi River Commission (Army)125
- Mississippi River Commission (Engineer Department, War Department)3
- Mississippi River Levees and Improvement Committee1
- Mississippi River, Committee on Levees and Improvements of (House)3
- Missouri Basin Inter-Agency Committee122
- Missouri River Basin Commission1
- Missouri River Commission12
- Missouri, Department of the1
- Mixed Claims Commission, United States and Germany194
- Mixes Bureau53
- Money Orders Division73
- Money Orders, Division of1
- Monographs.8
- Morale Branch2
- Morale Services Division69
- Mortgage Interest Rates Commission1
- Motion Pictures Division8
- Motion Pictures Office6
- Motor Carrier Safety Bureau139