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…when the material is not procured to NCAMP Material Specification 688/2 Rev B.
NMS 688/2 Rev B is a free, publicly available, non-proprietary aerospace industry material
specification.
The data in this report is intended for general distribution to the public, either freely or at a price
that does not exceed the cost of reproduction (e.g. printing)…
https://www.wichita.edu/industry_and_defense/NIAR/Research/tencate-tc250/12k-HTS40-3.pdf