TY  - RPRT
TI  - Digital line graphs from 1:2,000,000-scale maps
AU  - Michael A. Domaratz
AU  - C.A. Hallam
AU  - W.E. Schmidt
AU  - H.W. Calkins
PY  - 1983
DO  - 10.3133/cir895d
UR  - https://pubs.usgs.gov/publication/cir895D
ID  - cir895D
ER  -