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- catalog contributor b2684863.
- catalog contributor b2684864.
- catalog contributor b2684865.
- catalog contributor b2684866.
- catalog created "[1986]".
- catalog date "1986".
- catalog date "[1986]".
- catalog dateCopyrighted "[1986]".
- catalog description "Includes bibliographical references (leaves 16-18).".
- catalog extent "18 leaves ;".
- catalog isPartOf "Technical report (Educational Technology Center (Cambridge, Mass.)) ; 86-6".
- catalog isPartOf "Technical report ; TR86-6".
- catalog issued "1986".
- catalog issued "[1986]".
- catalog language "eng".
- catalog publisher "Cambridge, MA : Educational Technology Center, Harvard Graduate School of Education,".
- catalog subject "Cognition in children Research.".
- catalog subject "Computer programming Study and teaching (Secondary) Research.".
- catalog subject "QA76.27 .P47 1986".
- catalog title "Loci of difficulty in learning to program / prepared by D.N. Perkins, Fay Martin, and Michael Farady.".
- catalog type "text".