Report Of Progress In The Venango County District. By John F. Carll. Observations On The Geology Around Warren. By F. A. Randall. Note On The Comparative Geology Of Northern Ohio And North-Western Pennsylvania And Western New York. By J. P. Lesley.
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Recensies van Report Of Progress In The Venango County District. By John F. Carll. Observations On The Geology Around Warren. By F. A. Randall. Note On The Comparative Geology Of Northern Ohio And North-Western Pennsylvania And Western New York. By J. P. Lesley. door John Franklin Carll