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21986834
21986834
http://www.worldcat.org/oclc/21986834
Educational software at secondary level : proceedings of the IFIP TC 3/WG 3.1 working conference on educational software at secondary level, Reykjavik, Iceland, 18-22 June, 1989 / ed. by J. David Tinsley [and] Tom J. van Weert
sameAs
21986834
http://www.worldcat.org/oclc/21986834