TY  - RPRT
TI  - Digital line graphs from 1:24,000-scale maps
AU  - William R. Allder
AU  - Atef A. Elassal
PY  - 1984
DO  - 10.3133/cir895c
UR  - https://pubs.usgs.gov/publication/cir895C
ID  - cir895C
ER  -