| 000 | nam a22 4500 | ||
|---|---|---|---|
| 245 | _aCanal safety : safety in the operation of canals and ofher waterway structures. | ||
| 260 |
_as.l. _bUnited States Department of the Interior Bureau of Recramation. _c[198-?] |
||
| 710 | _aUnited States Department of the Interior Bureau of Recramation | ||
| 942 | _c22 | ||
| 999 |
_c5346 _d5346 |
||