Standard and Tentative Methods of Sampling and Testing Highway Materials: Recommended by the Second Conference of State Highway Testing Engineers and Chemists, Washington, D.C., Feb. 23-27, 1920, Issues 926-950
Alexander Wetmore · Arnold Orlando Dahlberg · Brayton Howard Ransom · Carl Hartley · Charles Dwight Marsh · Charles Franklin Creswell · Clarence William Kitchen · Clinton Gold Smith · Edouard Horace Siegler · Edward Browning Meigs · Frederick Storrs Baker · George Arthur Bell · George Durward Smith · Harrison Morton Dixon · Harry Taylor Edwards · Howard Ross Tolley · James Houston Shrader · Joseph Martin Mehl · Martin Reese Cooper · Norman Eugene McIndoo · Ralph Hoagland · Samuel Henry Ayers · William Ransom Meadows · A. B. Clawson · Edward M. Seifert · Frank Rabak · George Leslie Bidwell · H. S. Garner · J. M. Purdom · John Oscar Williams · Lillian M. Church · Paul Wescoe Clemmer · Raymond Secord Washburn · Thompson Elwyn Woodward · William Gardiner Blair · Mary B. Hall
Jan 1922 · U.S. Department of Agriculture