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2. Hollberg , H. E. Armbrust , H. N. Diatomaceous-Earth Filtration Proc. 6th Annual Water Conj., Engrs. Soc. of Western Pennsylvania 95 1945
3. Studies on Diatomaceous-Earth Filtration;Sanchis;Jour. AWWA,1951
4. Use of Diatomite Filters Can Be Economical;Baumann;W. W. Eng.,1953
5. Baumann , E. R. Babbitt , H. E. Effect of Body Feed on the Filtration of Water Through Diatomite Univ. of Illinois Eng. Experiment Station Buls. 425 1954