TY  - RPRT
TI  - Nonprofit sample and core repositories open to the public in the United States
AU  - J. W. Schmoker
AU  - Thomas C. Michalski
AU  - Patricia B. Worl
PY  - 1984
DO  - 10.3133/cir942
UR  - https://pubs.usgs.gov/publication/cir942
ID  - cir942
ER  -