A study of lumber used for bracing trenches in the United States
By: Lawrence I. Knab ... [et al.] , Center for Building Technology, National Engineering Laboratory, National Bureau of Standards
Contributors: Knab, Lawrence I; United States. National Bureau of Standards; United States. Occupational Safety and Health Administration
Series: NBS building science series ; 122; Building science series -- 122
Publisher: Dept. of Commerce, National Bureau of Standards : for. sale by the Supt. of Docs., U.S. Print. Off.
Published: 1980
Place of publication: Washington
Language: eng
Number of pages: 218
Subjects: Lumber -- Inspection; Shoring and underpinning; Lumber -- Standards
Notes: Report to Occupational Safety and Health Administration, Department of Labor

Issued Mar. 1980

Bibliography: p. D-20