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17951. Sulphur. Sulphur and pyrites in 1930; by Robert H. Ridgway.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Nov. 6, 1931
SuDoc number:: C 22.8/a:Su 5/930

17952. Arsenic, bismuth, selenium, and tellurium in 1930; by V. C. Heikes.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Nov. 4, 1931
SuDoc number:: C 22.8/a:Ar 72/2/930

17953. Gold. Gold, silver, copper, lead, and zinc in Colorado in 1929, mine report; by Chas. W. Henderson.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Oct. 31, 1931
SuDoc number:: C 22.8/a:G 563/4/929

17954. Mercury in 1930; by Paul M. Tyler.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Oct. 28, 1931
SuDoc number:: C 22.8/a:M 539/930

17955. Coke and by-products in 1929; by F. G. Tryon and H. L. Bennit.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Oct. 16, 1931
SuDoc number:: C 22.8/a:C 66/929

17956. Silica in 1930; by E. R. Phillips.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Oct. 16, 1931
SuDoc number:: C 22.8/a:Si 34/930

17957. Gypsum in 1930; by R. M. Santmyers and Jefferson Middleton.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Oct. 8, 1931
SuDoc number:: C 22.8/a:G 998/930

17958. Gold. Gold, silver, copper, lead, and zinc in Eastern States in 1930, mine report; by J. P. Dunlop.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Oct. 7, 1931
SuDoc number:: C 22.8/a:G 563/5/930

17959. Graphite in 1930; by Jefferson Middleton.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Oct. 7, 1931
SuDoc number:: C 22.8/a:G 76/930

17960. Coal in 1929; by F. G. Tryon and L. Mann.

Corporate/Agency Authors:: Mines Bureau and Commerce Department
Publisher:: Mines Bureau
Date:: Oct. 1931
SuDoc number:: C 22.8/a:C 631/929

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