Experiments On Strength Of Small Pillars Of Coal In The Pittsburgh Bed PDF Download

Excerpt from Weathering of the Pittsburgh Coal Bed, at the Experimental Mine, Near Bruceton, Pa The Bureau of Mines, in carrying out one of the provisions of its organic act - to disseminate information concerning investigations made - prints a limited free edition of each of its publications. When this edition is exhausted copies may be obtained at cost price only through the Superintendent of Documents, Government Printing Office, Washington, D. C., who is the authorized agent of the Federal Government for the sale of all publications. The Superintendent of Documents is not an official of the Bureau of Mines. His is an entirely separate office and he should be addressed: Superintendent of Documents, Government Printing Office, Washington, D. C. The general law under which publications are distributed prohibits the giving of more than one copy of a publication to one person. Additional copies must be purchased from the Superintendent of Documents. The cost of this Technical Paper is 5 cents. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.