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Hughes, H. Herbert / Minerals yearbook 1940
Year 1939 (1940)
Johnson, Bertrand L.; Warner, K. G.
Phosphate rock, pp. 1301-1320
Page 1301
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As a work of the United States government, this material is in the public domain.| For information on re-use see: http://digital.library.wisc.edu/1711.dl/Copyright




