TY  - RPRT
TI  - Deposits of manganese ore in Costa Rica. Deposits of manganese ore near Boqueron River, Panama
AU  - Julian Ducker Sears
PY  - 1920
DO  - 10.3133/b710c
UR  - https://pubs.usgs.gov/publication/b710C
ID  - b710C
ER  -