Digitizing procedure for the National Coal Resources Data System of the U.S. Geological Survey
By: by Judy F. Hunter, Sharon S. Crowley, and Antoinette L. Medlin
Contributors: Crowley, Sharon S; Medlin, Antoinette L
Series: Open-file report -- 81-1225; Open-file report (Geological Survey (U.S.)) -- 81-1225
Publisher: U.S. Dept. of the Interior, Geological Survey
Published: 1981
Place of publication: [Reston, Va.?]
Language: eng
Format: Microform
Subjects: Coal -- Data processing; Information storage and retrieval systems -- Mines and mineral resources
Notes: Microfiche. [Denver, Colo. : U.S. Geological Survey, 1981?]. 1 microfiche ; 11 x 15 cm