TY  - RPRT
TI  - Contour map of the base of Saprolite, Howard County, Maryland
AU  - J.B. Roen
AU  - A.J. Froelich
PY  - 1976
DO  - 10.3133/mf772a
UR  - https://pubs.usgs.gov/publication/mf772A
ID  - mf772A
ER  -