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National Council of Teachers of Mathematics
> William P Heck
William P Heck
title
ISBN-13
(ISBN-10)
year of publication
Guidelines for evaluating computerized instructional materials
978-O-87353-176-4
(O-87353-176-O)
1981
P. H.
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W H
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W.P.
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William H.
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William P.
William P. Helling