Columbia subject headings:
Geology--Pacific States--Guidebooks.
Pacific States--Guidebooks.
Harvard subject headings:
Geology--Alaska--Guidebooks.
Geology--British Columbia--Guidebooks.
Geology--Hawaii--Guidebooks.
Geology--West (U.S.)--Guidebooks.
Pacific States--Guidebooks
Princeton subject headings:
Geology--Pacific States--Guidebooks.
Guidebooks.
Pacific States--Description and travel.
Pacific States--Guidebooks.