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5. Efficiency of standard Army water purification equipment and of diatomite filters in removing cysts of Endamoeba histolytica from water: for official action

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8. Ohio River pollution control: letter from the acting secretary of war, transmitting a letter from the chief of engineers, United States Army, dated May 4, 1943, forwarding a report, together with accompanying papers and illustrations, on a survey of the Ohio River and its tributaries for pollution control, authorized by section 5 of the River and harbor act, approved August 26, 1937 (Volume 1)

nlm:nlmuid-31020370RX1-mvpart

9. Ohio River pollution control: letter from the acting secretary of war, transmitting a letter from the chief of engineers, United States Army, dated May 4, 1943, forwarding a report, together with accompanying papers and illustrations, on a survey of the Ohio River and its tributaries for pollution control, authorized by section 5 of the River and harbor act, approved August 26, 1937

nlm:nlmuid-31020370R-mvset

10. Ohio River pollution control: letter from the acting secretary of war, transmitting a letter from the chief of engineers, United States Army, dated May 4, 1943, forwarding a report, together with accompanying papers and illustrations, on a survey of the Ohio River and its tributaries for pollution control, authorized by section 5 of the River and harbor act, approved August 26, 1937 (Volume 2)

nlm:nlmuid-31020370RX2-mvpart