Published by Teachers Exchange of San Francisco, San Francisco, 1971
Seller: Tavistock Books, ABAA, Reno, NV, U.S.A.
First Edition
1st printing (presumed). 15 number 'flash' cards of white stiff-stock paper, each with a geometric shape to recto & verso. 8" x 7" A tangram is "a Chinese geometric puzzle consisting of a square cut into seven pieces that can be arranged to make various other shapes." [Wiki]. OCLC records two holding institutions, both in Ohio. Card 1 with pen marks to title & page number, otherwise VG overall. Now housed in a clear archival mylar sleeve.