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17991. Coal. Pennsylvania anthracite in 1929; by H. O. Rogers, O. E. Kiessling, and H. L. Bennit.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Feb. 25, 1931
SuDoc number:: C 22.8/a:An 86/2/929

17992. Metals. Secondary metals in 1929 [with bibliographies]; by J. P. Dunlop.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Feb. 24, 1931
SuDoc number:: C 22.8/a:Se 24/929

17993. Natural gas in 1929; by G. R. Hopkins and H. Backus.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Feb. 3, 1931
SuDoc number:: C 22.8/a:G 21/929

17994. Gasoline. Natural gasoline in 1929; by G. R. Hopkins and E. M. Seeley.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Jan. 26, 1931
SuDoc number:: C 22.8/a:G 212/929

17995. Lime in 1929; by A. T. Coons.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Jan. 14, 1931
SuDoc number:: C 22.8/a:L 629/929

17996. Silver, copper, had, and zinc in Central States in 1929, mine report; by J. P. Dunlop and H. M. Meyer.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Jan. 10, 1931
SuDoc number:: C 22.8/a:Si 39/929

17997. Barite and barium products in 1929; by R. M. Santmyers and B. H. Stoddard.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Jan. 7, 1931
SuDoc number:: C 22.8/a:B 239/929

17998. Bornite. Chemistry of leaching bornite; by John D. Sullivan.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: 1931
SuDoc number:: C 22.5:486

17999. Coal mines and mining. Concrete stoppings in coal mines for resisting explosions, detailed tests of typical stoppings and strength of coal as a buttress; by George S. Rice, H. P. Greenwald, H. C. Howarth, and S. Avins.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: 1931
SuDoc number:: C 22.3:345

18000. Coal mines and mining. Explosions in Washington coal mines; by S. H. Ash.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: 1931
SuDoc number:: C 22.5:507

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