"Division of Engineering Laboratories.""September 30, 1955."Mode of access: Internet
"Work performed under Contract No. AT(004-3)-130.""March 29, 1957."Mode of access: Internet
On cover: University of Iowa studies. New series, no. 230.Mode of access: Internet
"Advance sheets, field operations of the Bureau of Soils, 1917."Mode of access: Internet
"Division of Engineering Laboratories.""October 4, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""August 23, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""December 2, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""September 23, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""December 30, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""December 29, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""December 13, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""October 3, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""November 30, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""July 25, 1955."Includes bibliographic references (page 5).Mo...
"May 1959."Performed by California Division of Highways Land Economics Studies Section.Cover title.M...
Cover title.Includes bibliographical references (page 118).Final report.Mode of access: Internet
"Work performed under Contract No. AT(004-3)-130.""March 29, 1957."Mode of access: Internet
On cover: University of Iowa studies. New series, no. 230.Mode of access: Internet
"Advance sheets, field operations of the Bureau of Soils, 1917."Mode of access: Internet
"Division of Engineering Laboratories.""October 4, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""August 23, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""December 2, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""September 23, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""December 30, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""December 29, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""December 13, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""October 3, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""November 30, 1955."Mode of access: Internet
"Division of Engineering Laboratories.""July 25, 1955."Includes bibliographic references (page 5).Mo...
"May 1959."Performed by California Division of Highways Land Economics Studies Section.Cover title.M...
Cover title.Includes bibliographical references (page 118).Final report.Mode of access: Internet
"Work performed under Contract No. AT(004-3)-130.""March 29, 1957."Mode of access: Internet
On cover: University of Iowa studies. New series, no. 230.Mode of access: Internet
"Advance sheets, field operations of the Bureau of Soils, 1917."Mode of access: Internet