TY  - RPRT
TI  - Preliminary report on the Serra de Navio manganese district, Territory of Amapa, Brazil
AU  - John Van N. Dorr
AU  - Philip White Guild
PY  - 1948
DO  - 10.3133/ofr4829
UR  - https://pubs.usgs.gov/publication/ofr4829
ID  - ofr4829
ER  -