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- catalog contributor b3006844.
- catalog contributor b3006845.
- catalog created "[1987]".
- catalog date "1987".
- catalog date "[1987]".
- catalog dateCopyrighted "[1987]".
- catalog description "Includes bibliographical references (p. 46).".
- catalog extent "46 p. [i.e. leaves] :".
- catalog isPartOf "Technical report (Educational Technology Center (Cambridge, Mass.)) ; 87-8.".
- catalog isPartOf "Technical report ; TR87-8".
- catalog issued "1987".
- catalog issued "[1987]".
- catalog language "eng".
- catalog publisher "Cambridge, MA : Educational Technology Center, Harvard Graduate School of Education,".
- catalog subject "Mathematics Computer-assisted instruction.".
- catalog subject "Software architecture.".
- catalog title "A concrete-to-abstract software ramp : environments for learning multiplication, division, and intensive quantity / prepared by James J. Kaput, Laurie Pattison-Gordon.".
- catalog type "text".