Knab, L.
, Galligan, W.
, Bendtsen, B.
and Senft, J.
(1980),
A Study of lumber used for bracing trenches in the United States:, Building Science Series, National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NBS.BSS.122
(Accessed October 10, 2024)