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September 1, 1904, to December 31, 1908
October, 1914, to April, 1915
And Their Effects on Structures and Structural Materials
This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in...
(southern Beaver and Northwestern Allegheny Counties)
A Preliminary Report
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was ...
Compiled from Etest Made by the Technologic Branch of the United States Geological Survey at the St. Louis Mo. Fuel Testing Plant, 1904-June 30, 1907
Report and Maps
Field work, classification of coals, chemical work