LOBACHEVSKIAN DONOR: You get a numbered first edition copy, signed by Margaret and Christine. Plus we'll list your name in the book on the SPECIAL DONORS PAGE under the Lobachevskian category. You are guaranteed to get one of the first 20 numbered books, plus an additional copy. Plus a signed copy of our book "A Field Guide to Hyperbolic Space". Plus one of a Limited Edition set of crochet hyperbolic models. SHIPPING INCLUDED ANYWHERE IN THE WORLD.

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