The Birth of Wonder Woman

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From Letters of Note:

Here we have a piece of comic book history from early-1941 in the form of a letter from cartoonist Harry G. Peter, written to William Moulton Marston, in which he unveils some very early sketches of Marston’s new superheroine, Wonder Woman; Marston’s handwritten response to Peter can also be seen, penned in red below the original message. Wonder Woman’s subsequent debut came just months later – December – in All Star Comics #8 (cover). The rest is history.

Transcripts can be found here.
Via thehighdefinite