1. Biological effects of wastes discharge to North Platte River in Torrington, Wyo. to Bridgeport, Nebraska Reach, Nov. 1960-Nov. 1961; [by] Joe K. Neel. Bookmark Corporate/Agency Authors: Environmental Protection Agency Publisher: Environmental Protection Agency Date: [1962.] SuDoc number: HE 20.2:N 81p/5/960-61