Hotchkiss, Robert S.
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Report of the United States Coal Commission. Part I. -- Pri.. 

United States congressional serial set ; serial set no. 8402-1;Senate document / 68th Congress, 2nd session. Senate ; no. 195, pt. 1
 
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2

Annual report of the Board of Regents of the Smithsonian In.. 

United States congressional serial set ; serial set no. 1573;Mis. doc. / 42nd Congress, 3rd session. House ; no. 107
 
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