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  1. 1
    Published 1981
    Denver, Colo : Washington, D.C. : U.S. Dept. of the Interior, Water and Power Resources Service ; For sale by the Supt. of Docs., U.S. G.P.O., [1981]
    p. : ill. ; 28 cm.
  2. 2
    [Washington, D.C., Water and Power Resources Service, U.S. Dept. of the Interior, etc.; for sale by the Supt. of Docs., U.S. Govt. Print. Off.]
    43 v. ill. 26 cm.
    Also issued online.

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