A User's manual for a method of map scanning and digital editing for thematic map production and data-base construction /
Soller, D. R.(David R.)
Washington, D.C. : U.S. G.P.O. ; Denver, CO : Free on application to the Books and Open-File Reports Section, U.S. Geological Survey,
1990.
Includes bibliographical references (p. 35).
Digital mapping.
Scanning systems.