Title
Codes for the identification of hydrologic units in the United States and the Caribbean outlying areas / developed under a memorandum of understanding with Geological Survey, U.S. Department of the Interior.
Published
[Washington D.C.?] : U.S. Dept. of Commerce, National Bureau of Standards ; Springfield, VA : For sale by the National Technical Information Service, U.S. Dept. of Commerce, 1984-