That sounds like a great book. If anyone has a spare copy, I'd love to buy a copy.
I did find this link that others might find useful https://www.postwarcards.com/how-to-...d-mark-murphy/
There's also this old thread from Net54 https://www.net54baseball.com/showthread.php?t=180489
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Working on the following sets: 1916 and 1917 Zeenut, 1954B, 1955B, 1971T and 1972T
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