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Collapse of U.S. 35 Highway Bridge, Point Pleasant, West Virginia, December 15, 1967 (HAR-71/01)
National Transportation Safety Board · 1970-12-16 · 202 pages · text by OCR, confidence 99%
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(a) Outer Surface
(b) Martensite at 0.2" depth
(c) Interior
Figure 8 - Micro Structure of Eyebars Material (NBS Photos)
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Document, cited by the archive. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model (mean confidence 99%); expect the odd misread word. 202 pages are in the text index: search them above, or from the library's search.