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4531. Mines and mining. Measurement of pressures on rock pillars in underground mines [with bibliography]; by Leonard Obert.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: Apr. 1939
SuDoc number:: I 28.23:3444

4532. Molybdenum. Progress reports, Metallurgical Division: 28, Analytical studies, volumetric determination of molybdenum; by C. E. Arlington and A. C. Rice.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: Apr. 1939
SuDoc number:: I 28.23:3441

4533. Petroleum. Analyses of crude oils from some fields of Oklahoma; by O. C. Blade.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: Apr. 1939
SuDoc number:: I 28.23:3442

4534. Petroleum. Effect of acid treatment upon ultimate recovery of oil from some limestone fields of Kansas; by R. E. Heithecker.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: Apr. 1939
SuDoc number:: I 28.23:3445

4535. Asphalt. Some asphalts from Oregon Basin, Wyo., crude oil; by K. E. Stanfield.

Corporate/Agency Authors:: Mines Bureau and Government Printing Office
Publisher:: Mines Bureau
Date:: Mar. 1939
SuDoc number:: I 28.23:3435

4536. Electrometallurgy. Progress reports, Metallurgical Division: 30, Electrometallurgical investigations, recovery of potassium sulphate and alumina from alunite by fusion with boric acid; by J. Koster, R. G. Knickerbocker, A. L. Fox, and P. R. Perry.

Corporate/Agency Authors:: Mines Bureau and Government Printing Office
Publisher:: Mines Bureau
Date:: Mar. 1939
SuDoc number:: I 28.23:3438

4537. Ores. Progress reports, Metallurgical Division: 31, Ore-dressing studies, flotation of southern Illinois lead-zinc-fluospar ores; by J. B. Clemmer, W. E. Duncan, F. D. DeVaney, and M. Guggenheim.

Corporate/Agency Authors:: Mines Bureau and Government Printing Office
Publisher:: Mines Bureau
Date:: Mar. 1939
SuDoc number:: I 28.23:3437

4538. Coal. Carbonizing properties of subbituminous coal from Puritan mine, Dacono, Weld County, Colo.; by J. D. Davis and V. F. Parry.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: Feb. 1939
SuDoc number:: I 28.23:3428

4539. Reclamation of stripped coal land; by Albert L. Toenges.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: Feb. 1939
SuDoc number:: I 28.23:3440

4540. Silver. Progress reports, Metallurgical Division: 29, Silver-recovery studies, some factors affecting flotation of silver minerals; by E. S. Leaver and J. A. Woolf.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: Feb. 1939
SuDoc number:: I 28.23:3436

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