TY  - RPRT
TI  - Iron and manganese
AU  - E. F. Burchard
AU  - A.C. Spencer
AU  - W. C. Phalen
PY  - 1908
DO  - 10.3133/b340e
UR  - https://pubs.usgs.gov/publication/b340E
ID  - b340E
ER  -