Wartime report L-370, L-428, L-429, L-434, L-482, L-544, L-583, L-630, L-632, L-634, L-644, L-682. L-429. Charts for calculation of critical stress for local instability of columns with I-, Z-, channel and rectangular-tube section [with list of references]; by W. D. Kroll, Gordon P. Fisher, and George J. Heimerl.

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