TY  - RPRT
TI  - The manganese oxide minerals, a preliminary report
AU  - Michael Fleischer
AU  - W.E. Richmond
PY  - 1943
DO  - 10.2113/gsecongeo.38.4.269
UR  - https://pubs.usgs.gov/publication/70213009
ID  - 70213009
ER  -