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27041. Topographic sheets. Oregon, Halsey quadrangle, lat. 44° 15′-44° 30′, long. 123°-123° 15′. Scale 1:62,500, contour Interval 10 and 25 ft.

Corporate/Agency Authors:: Geological Survey and Interior Department
Publisher:: Geological Survey
Date:: edition of Dec. 1912

27042. Topographic sheets. Pennsylvania, Hilliards quadrangle, lat. 41°-41° 15′, long. 79° 45′-80°. Scale 1:62,500, contour interval 20 ft.

Corporate/Agency Authors:: Geological Survey and Interior Department
Publisher:: Geological Survey
Date:: edition of Dec. 1912

27043. Topographic sheets. Texas, Rockwall quadrangle, lat. 32° 52′ 30″-33°. long. 96° 27′ 30″-96° 35′. Scale 1:31,680, contour interval 5 ft.

Corporate/Agency Authors:: Geological Survey and Interior Department
Publisher:: Geological Survey
Date:: edition of Dec. 1912

27044. [Decisions of commissioner of patents and of United States courts in patent cases.]

Corporate/Agency Authors:: Patent Office and Interior Department
Publisher:: Patent Office
Date:: Nov. 20, 1912

27045. Truckee-Carson project, Nev., order.

Corporate/Agency Authors:: Interior Department
Publisher:: Interior Department
Date:: Nov. 14, 1912

27046. United States mining laws and regulations thereunder; approved Mar. 29, 1909.

Corporate/Agency Authors:: Land Office, General and Interior Department
Publisher:: Land Office, General
Date:: Reprinted Nov. 6, 1912 [with additions]

27047. Breathing-apparatus. Training with mine-rescue breathing apparatus [with list of bureau publications on mine accidents and explosives]; by James W. Paul.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1st edition.] [Nov.] 1912

27048. Investigations of explosives used in coal mines [with list of bureau publications on mine accidents and tests of explosives, articles] by Clarence Hall, W. O. Snelling, and S. P. Howell; with chapter on natural gas used at Pittsburgh. by G. A. Burrell; and introduction, by Charles E. Munroe.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [2d edition revised.] [Nov.] 1912

27049. Mine accidents. 1st national mine-safety demonstration, Pittsburgh, Pa., Oct. 30 and 31, 1911, by Herbert M. Wilson and Albert H Fay; with chapter on explosion at experimental mine, by George S. Rice.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [2d edition revised.] [Nov.] 1912

27050. Mine accidents. Accidents from falls of roof and coal [with list of bureau publications on mine accidents and tests of explosives]; by George S. Rice.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [3d edition revised.] [Nov.] 1912

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