Department Order
| Series | No | Title | Date | Supersedes |
|---|---|---|---|---|
| 1973 | 3 | Creating a separate Highway Engineering District in the Sub-province of Biliran. | January 15, 1973 | - - - |
| 1973 | 2 | Dividing the Province of Surigao del Norte into two (2) Highway Engineering Districts. | January 15, 1973 | - - - |
| 1973 | 1 | Dividing the Province of Bohol into two (2) Highway Engineering Districts. | January 15, 1973 | - - - |