Crocheted hyperbolic planes may be available in limited quantities. Contact Daina Taimina firstname.lastname@example.org for more information.
For ordering information on Lenart Sphere models and related supplements see http://www.keypress.com/product_info/lenartsph.html.
For discussions on using the sphere models, see http://forum.swarthmore.edu/~sarah/HTMLthreads/articletocs/lenart.sphere.html.
For numerous links to Web pages related to geometry (including numerous links to dynamic software activities) see http://atle.abc.se/~m9847/geometr.html.
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