TY  - RPRT
TI  - Phosphorite and other apatite-bearing sedimentary rocks in the Precambrian of northern Michigan
AU  - William F. Cannon
AU  - J. S. Klasner
PY  - 1976
DO  - 10.3133/cir746
UR  - https://pubs.usgs.gov/publication/cir746
ID  - cir746
ER  -