Letter from the secretary of the army / 
United States, Department of Environmental Resources 
 - Washington, D. C. :  The Department,  1973 
 - x, 299 p. ;  27 cm. 
<br/><br/> Hay creek Sheryl kill river Basin Pennsy Vania 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Military art and science--United States
<br/><br/><label>Dewey Class. No.: </label>355.00973