Note 9 — TRANSACTIONS (continued 2)
Reading edition
“Structural Materials Testing Laboratories,” by Richard L. Humphrey, Bulletin No. 329. U. S. Geological Survey, 1908; “Portland Cement Mortars and their Constituent Materials,” by Richard L. Humphrey and William Jordan, Jr., Bulletin No. 331, U. S. Geological Survey, 1908; “Strength of Concrete Beams,” by Richard L. Humphrey, Bulletin No. 344, U. S. Geological Survey, 1908.