Hopkins, David E.
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2

Contributions to economic geology (short papers and prelimi.. 

United States congressional serial set ; serial set no. 7363;House document / 65th Congress, 2nd session. House ; no. 606
 
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3

Contributions to economic geology (short papers and prelimi.. 

United States congressional serial set ; serial set no. 7007;House document / 64th Congress, 1st session. House ; no. 1250
 
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4

Forty-first annual report of the National Advisory Committe.. 

United States congressional serial set ; serial set no. 11917;Senate document / 84th Congress, 2nd session. Senate ; no. 90
 
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5

Yearbook of the United States Department of Agriculture, 19.. 

United States congressional serial set ; serial set no. 5314;House document / 60th Congress, 1st session. House ; no. 987
 
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6

Yearbook of the United States Department of Agriculture, 19.. 

United States congressional serial set ; serial set no. 5045;House document / 59th Congress, 1st session. House ; no. 892
 
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7

Yearbook of the United States, Department of Agriculture, 1.. 

United States congressional serial set ; serial set no. 4880;House document / 58th Congress, 3rd session. House ; no. 424
 
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