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Nitrate deposits of the United States, by G.R. Mansfield an.. 

United States congressional serial set ; serial set no. 9584;House document / 72nd Congress, 1st session. House ; no. 112
Boardman, Leona ; Mansfield, George Rogers , 1932
Link: http://docs.newsbank.com/select/serialset/11D8657DB85F..