Columbia subject headings:
Augusta County (Va.)--Maps.
Geological maps.
Geology--Virginia--Augusta County--Maps.
Geology--Virginia--Rockingham County--Maps.
Maps.
Quadrangle maps.
Rockingham County (Va.)--Maps.
Harvard subject headings:
Augusta County (Va.)--Maps.
Geology--Virginia--Augusta County--Maps.
Geology--Virginia--Rockingham County--Maps.
Rockingham County (Va.)--Maps.
Princeton subject headings: