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A study of lightweight aggregates. : Everhart, J.O., Ehlers E. G., Johnson J. E.: The sampling and evaluation program : Ehlers, E. G., Richardson, J. H.: Mineralogical factors involved in the formation of lightweight aggregates : Russell, Ralston, jr., Johnson, J. E.: Use of additives in promoting cellulation in nonbloating clays and shalse / J. O. Everhart, E. G. Ehlers, J. E. Johnson, J. H. Richardson, Ralston Russell j
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