Delton, Gordon <br/><br/>
U :  S Geological survey estimates of natural-gas energy resources 

 - U. S. Geological Survey Professional paper, 1570 .
<br/><br/>bibliogr. p. 504-506 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Centre de recherche<br/>Institution<br/>Histoire<br/>Gaz naturel<br/>Energie
<br/><br/><label>Subjects--Index Terms: </label>Etats Unis