by Reginald Peter Briggs
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Environmental geology, Allegheny County ...
Landsliding in Allegheny County, Pennsyl...
The Lower Cretaceous Figuera Lava and Fa...
Black Guano
Solution-collapse breccia pipes of Spani...
Episodic sediment-discharge events in Ca...
Breccia pipe and geologic map of the sou...
The Transvaal ape-man-bearing cave depos...
Geophysical studies of breccia pipe loca...
The potential for breccia pipes in the N...