Columbia subject headings:
Formations (Geology)--California--San Joaquin Valley--Congresses.
Geology--California--San Joaquin Valley--Congresses.
Harvard subject headings:
Geology, Stratigraphic--Miocene--Guidebooks.
Geology--California--San Joaquin Watershed--Guidebooks.
Mollusks, Fossil--California--Guidebooks.
Mollusks, Fossil--California--San Joaquin Valley--Handbooks, manuals, etc.
Princeton subject headings:
Formations (Geology)--California--San Joaquin Valley--Congresses.
Geology--California--San Joaquin Valley--Congresses.