Eckerman Keith, F. <br/><br/>
External exposure to radionuclides in air, water, and soil  
/ by Keith F. Eckerman and Jeffrey C. Ryman. 
 - Washington :  Office of Radiation and Indoor Air U.S. Environmental Protection Agency,  1993. 
 - 235 p. ;  28 cm. 
<br/><br/><label>Dewey Class. No.: </label>612.01448 ECK  / 2033