Leidel, Nelson A. <br/><br/>
Exposure measurement action level and occupational environmental variability / 
by Nelson A. Leidel, Kenneth A. Busch and William E. Crousc 
 - Washington, D. C. :  United States Government Printing Office,  1975 
 - vii, 38 p. ;  27 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Occupational diseases--United States<br/>Environmental monitoring--United States
<br/><br/><label>Dewey Class. No.: </label>363.1790973