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  1. Manuals have a copyright year (which denotes the edition) and a printing date. The printing date is denoted with a printer code in the form of letter-number-letter-number (for example, D-72-D-50, meaning April 1939), or "month year" for those books printed after March 1942. Reprints are exactly the same as the last copyrighted version.

    As far as I know, the Anniversary FM manual had only one edition (published in 1936), with numerous reprints. The next edition of the FM manual was the FM Simplified series.

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