To promote development and conservation of phosphate resources :  hearing before Subcommittee on Minerals, Materials and Fuels, 85th Congress, 1st session, on S. 334, Mar. 20, 1957. 

 - [Washington, D.C.],  1957. 
 - iv, 87 p. :  ill. 
<br/><br/> Distribution made by issuing office.  CRDP Program Historic Shelflist record. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Phosphate leases--United States.
<br/><br/><label>GPO Item No.: </label>1040 
<br/><br/><label>Gov. Doc. Class. No.: </label>Y 4.IN 8/13:P 56