The citation in the caption of Solution 11.2 should be to Lindgren (1951).
The citation in the caption of Solution 11.3 should be to the 1991 revision of (Gardner 1969).
(This is corrected in the paperback edition.)
In the hinged assemblage on the left of Solution 12.2, the small triangle on the left is drawn a bit too big and is oriented incorrectly. The leftmost vertex of this triangle should be down and to the right of the vertex above it, not down and to the left.
(This is corrected in the paperback edition.)
Copyright 1999-2000, Greg N. Frederickson.
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Last updated October 29, 2000.