Columbia subject headings:
Geology, Stratigraphic--Cambrian--Guidebooks.
Geology, Stratigraphic--Precambrian--Guidebooks.
Geology--England--Shropshire Region--Guidebooks.
Shropshire (England)--Guidebooks.
Harvard subject headings:
Princeton subject headings:
Geology, Stratigraphic--Cambrian.
Geology, Stratigraphic--Precambrian.
Geology--England--Shropshire--Guidebooks.
Shropshire (England)--Guidebooks.