BAHLS, L.L. <br/><br/>
ECOLOGY AND DISTRIBUTION OF MAJOR DIATOM ECOTYPES IN THE SOUTHERN FORT UNION COAL REGION OF MONTAN 

 - WASHINGTON: USDI.,  1984 
 - 151P; ILLUST 
 - U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1289 .
<br/><br/><br/>ENG 
<br/><br/><label>Subjects--Topical Terms: </label><br/>WATER QUALITY BIOASSAY-MONTANA-FORT UNION.<br/>DIATOMS-MONTANA-FORT UNION COAL REGION.<br/>PLANT INDICATORS-MONTANA.