A Study of lumber used for bracing trenches in the United States
Subtitle: report to Occupational Safety and Health Administration, Department of Labor, Washington, D.C. 20210
By: Lawrence I. Knab ... [et al.].
Contributors: Knab, Lawrence I.; United States. Occupational Safety and Health Administration.
Series: NBS building science series ; 122; NBS building science series ;; 122.
Publisher: U.S. Dept. of Commerce, National Bureau of Standards : for sale by the Supt. of Docs., U.S. Govt. Print. Off.
Published: 1980
Place of publication: Washington, D.C
Language: eng
Number of pages: 218
Subjects: Retaining walls -- Materials -- United States.; Excavation.; Lumber.
Notes: Includes bibliographies.
"Issued March 1980."