Scott Catalog # : 3906 - 3909 / Fleetwood First Day Covers.
Set includes: 3906 Barbara McClintock / 3907 Josiah Williard Gibbs / 3908 John von Neumann and 3909 Richard Feynman
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Scott Catalog # : 3906 - 3909 / Mystic First Day Covers.
Set includes: 3906 Barbara McClintock / 3907 Josiah Williard Gibbs / 3908 John von Neumann and 3909 Richard Feynman.
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