TY  - RPRT
TI  - Geologic map of the Zwedru Quadrangle, Liberia
AU  - E. R. Force
AU  - H. M. Beikman
PY  - 1977
DO  - 10.3133/i777d
UR  - https://pubs.usgs.gov/publication/i777D
ID  - i777D
ER  -