Streamflow conditions for the conterminous United States and southern Canada : annual maps (water years 1921-90) and monthly maps (water years 1945-90)
- by Krishnaveni V. Sarma.
- Reston, VA : U.S. Geological Survey ; Denver, Colo. : Books and Open-file Reports Section [distributor], 
- Physical description
- 1 videocassette (10 min.) : silent color ; 1/2 in.
- U.S. Geological Survey open-file report ; 90-160.
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