TY  - RPRT
TI  - A Study of lumber used for bracing trenches in the United States 
AU  - Knab, Lawrence I
AU  - Galligan, William L
AU  - Bendtsen, B A
AU  - Senft, John F
PY  - 1980
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS BSS 122
DO  - 10.6028/NBS.BSS.122
ER  -