TY  - RPRT
TI  - American species of Operculina and Heterostegina and their faunal relations; A new species of Orthophragmina from Louisiana
AU  - J.A. Cushman
PY  - 1921
DO  - 10.3133/pp128e
UR  - https://pubs.usgs.gov/publication/pp128E
ID  - pp128E
ER  -