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- catalog contributor b2255812.
- catalog contributor b2255813.
- catalog created "1967.".
- catalog date "1967".
- catalog date "1967.".
- catalog dateCopyrighted "1967.".
- catalog description "Thesis (Ed. D.)--Harvard Graduate School of Education, 1967.".
- catalog extent "1 v. in various foliations :".
- catalog issued "1967".
- catalog issued "1967.".
- catalog language "eng".
- catalog subject "Arithmetic Study and teaching.".
- catalog subject "Programmed instruction.".
- catalog title "An investigation of selected individual difference variables in programmed instruction / Floyd Potts.".
- catalog type "text".