TY - BOOK ID - 138811916 TI - An Enhanced digital line graph design : a feature-based data model for digital spatial data bases that represent geographic phenomenon AU - Guptill, Stephen C. AU - Boyko, Kenneth J. AU - Geological Survey (U.S.) PY - 1990 PB - [Reston, Virginia] : [Washington] : Department of the Interior, U.S. Geological Survey, United States Government Printing Office, DB - UniCat KW - Digital mapping. UR - https://www.unicat.be/uniCat?func=search&query=sysid:138811916 AB - ER -