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Penumbra is available on Amazon in hardcover, paperback, and e-book format! Go here: Penumbra

I also have a limited number of 1st edition autographed copies available! You may purchase those using the listings on this page.

Penumbra autographed 1st edition - Hardcover

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Penumbra autographed 1st edition - Hardcover 00001
$22.99 In stock