Bahls, Loren L.2015-05-092015-05-091971https://scholarworks.montana.edu/handle/1/4105enDiatomsSewage disposalEcology of the diatom community of the upper East Gallatin River, Montana with in situ experiments on the effect of current velocity on features of the aufwuchsDissertationCopyright 1971 by Loren Louis Bahls