TY  - RPRT
TI  - Map showing contours on the base of saprolite, Fairfax County, Virginia
AU  - A.J. Froelich
AU  - T.L. Heironimus
PY  - 1977
DO  - 10.3133/ofr77710
UR  - https://pubs.usgs.gov/publication/ofr77710
ID  - ofr77710
ER  -