Civil aeronautics manuals: v. 2, supp. 13, Revisions to CAM 1 [Certification, identification, and marking of aircraft and related products] Nov. 1956, CAM 3 [Airplane airworthiness, normal, utility, and acrobatic categories, 2d edition] Oct. 1956, and CAM 6 [Rotorcraft airworthiness, normal category, 2d edition] Nov. 1956; Sept. 23, 1957.

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