1.
Theory of 2-Structures A Framework for Decomposition and Transformation of Graphs
by Ehrenfeucht, Andrezj, Harju...
ISBN: 9789810240424
List Price: $61.00
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Breaking Away from the Math Book II More Creative Projects for Grades K-8
by Baggett, Patricia, Ehrenfeu...
ISBN: 9781566765718
List Price: $34.95