Doorways in the Sand [signed]
![Doorways in the Sand [signed]](http://pictures.abebooks.com/isbn/9780060147891-us.jpg)
sku: COM9780060147891SIGNED
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Description
Fred Cassidy, thirteen years an undergraduate and an acrophiliac, joins Professor Paul Byler in a search for their laboratory replica of an alien artifact of interest to more than one interstellar community
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