(1)  Cited on p. 112 of <i>About Teaching Mathematics: A K-8 Resource</i> by Marilyn Burns. Sausalito, CA: Math Solutions Pub., 1992.<p>

(2) <i>Anno's Counting House</i> by Mitsumasa Anno.  New York: Philomel Books, 1982.<p>

(3) <i>Anno's Math Games II</i> by Mitsumasa Anno.  New York: Philomel Books, 1982.<p>

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