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SECOND GEOLOGICAL SURVEY OF PENNSYLVANIA.
REPORT OF PROGRESS.
PPP.
CERATIOCARIDÆ
FROM THE
UPPER DEVONIAN MEASURES
IN WARREN COUNTY,
BY
Chas. E. Beecher.
With 2 plates.
BY
James Hall.
With 6 plates.
HARRISBURG:
PUBLISHED BY THE BOARD OF COMMISSIONERS
FOR THE SECOND GEOLOGICAL SURVEY.
1884.