TY  - RPRT
TI  - Amygdule mineral zoning in the Portage Lake lava series, Michigan copper district
AU  - R.E. Stoiber
AU  - Edward S. Davidson
PY  - 1959
DO  - 10.2113/gsecongeo.54.8.1444
UR  - https://pubs.usgs.gov/publication/70211566
ID  - 70211566
ER  -