TY - BOOK AU - BAHLS, L.L. TI - ECOLOGY AND DISTRIBUTION OF MAJOR DIATOM ECOTYPES IN THE SOUTHERN FORT UNION COAL REGION OF MONTAN PY - 1984/// CY - WASHINGTON: USDI. KW - WATER QUALITY BIOASSAY-MONTANA-FORT UNION KW - DIATOMS-MONTANA-FORT UNION COAL REGION KW - PLANT INDICATORS-MONTANA ER -