TY  - RPRT
TI  - Free-iron and -manganese oxide content of reference clays
AU  - B. J. Anderson
AU  - E. A. Jenne
PY  - 1970
DO  - 10.1097/00010694-197003000-00004
UR  - https://pubs.usgs.gov/publication/70226768
ID  - 70226768
ER  -