Digitized hydrologic units for the United States at a scale of 1:2,500,000
By: Kenneth J. Lanfear and James C. Schornick, Jr
Contributors: Schornick, James C; Geological Survey (U.S.)
Series: U.S. Geological Survey open-file report -- 85-92
Publisher: U.S. Geological Survey
Published: 1985
Place of publication: [Reston, Va.?
Language: eng
Format: Microform
Subjects: Watersheds -- United States -- Maps; Information storage and retrieval systems -- Hydrology
Notes: Bibliography: p. 7

Microfiche. [Denver, Colo.? : U.S. Geological Survey, 1985?]. 1 microfiche ; 11 x 15 cm