TY - RPRT TI - A review of possible causes of nutrient enrichment and decline of endangered sucker populations in Upper Klamath Lake, Oregon AU - Gilbert C. Bortleson AU - Marvin O. Fretwell PY - 1993 DO - 10.3133/wri934087 UR - https://pubs.usgs.gov/publication/wri934087 ID - wri934087 ER -