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4501. Coal mines and mining. Studies of roof movement in coal mines: 2, Crucible mine of Crucible Fuel Co.; by E. R. Maize and H. P. Greenwald.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: June 1939
SuDoc number:: I 28.23:3452

4502. Coal. Classification chart of typical coals of United States, showing B. t. u. per pound on moist, mineral-matter-free basis, plotted against fixed carbon on dry, mineral-matter-free basis; by A. C. Fieldner, W. A. Selvig, and W. H. Frederic.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [Revised edition.] June 1939
SuDoc number:: I 28.23:3296/2

4503. Coal. Washability study of Black Creek coal bed at Yolande No. 6, Rockcastle, Ala.; by B. W. Gandrud, G. D. Coe, and J. C. Mead.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: June 1939
SuDoc number:: I 28.23:3450

4504. Dust (in industry). Relative air dustiness during cycle of operations at Mount Weather testing adit; by John A. Johnson and Wing G. Agnew.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: June 1939
SuDoc number:: I 28.23:3453

4505. Explosives Division. Annual report of Explosives Division, fiscal year 1938 [with list of Publications on explosives]; by Wilbert J. Huff.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: June 1939
SuDoc number:: I 28.23:3454

4506. Gasoline. Cooperative fuel research motor-gasoline survey, winter 1938-39; by E. C. Lane.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: June 1939
SuDoc number:: I 28.23:3455

4507. Bit gage v. drilling speed; by McHenry Mosier and Wing G. Agnew.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: May 1939
SuDoc number:: I 28.23:3447

4508. Coal. Classification of tabling of table middlings at Colta Coal Washery, Flat Creek, Ala.; by B. W. Gandrud, G. D. Coe, and H. J. Hager.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: May 1939
SuDoc number:: I 28.23:3448

4509. Coal. Expansion of coal during coking; by H. S. Auvil, J. D. Davis, and J. T. McCartney.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: May 1939
SuDoc number:: I 28.23:3451

4510. Coal. Washability study of Woodstock coal bed at Klondyke Mine, West Blocton, Ala.; by B. W. Gandrud and G. D. Coe.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: May 1939
SuDoc number:: I 28.23:3449

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