TY  - RPRT
TI  - Map showing distribution of alkaline igneous rocks and associated carbonatites and peridotites in the northern Midcontinent, U.S.A.
AU  - F. A. Hills
AU  - R. W. Scott
AU  - T.J. Armbrustmacher
AU  - Pieter Berendsen
PY  - 1991
DO  - 10.3133/mf1835f
UR  - https://pubs.usgs.gov/publication/mf1835F
ID  - mf1835F
ER  -