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- catalog contributor b8789036.
- catalog created "1951.".
- catalog date "1951".
- catalog date "1951.".
- catalog dateCopyrighted "1951.".
- catalog extent "iii, 8 pp.".
- catalog isPartOf "USAF School of Aviation Medicine distribution ; no. 1644".
- catalog issued "1951".
- catalog issued "1951.".
- catalog language "eng".
- catalog publisher "Randolph Field.".
- catalog title "Conspicuity of flashing and steady light signals. 1. Variation of contrast.".
- catalog type "text".