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- catalog alternative "Planning the systems approach to field testing educational products.".
- catalog contributor b4500055.
- catalog contributor b4500056.
- catalog created "1969.".
- catalog date "1969".
- catalog date "1969.".
- catalog dateCopyrighted "1969.".
- catalog description "Bibliography: p. 131-146.".
- catalog extent "vii, 156 p. :".
- catalog issued "1969".
- catalog issued "1969.".
- catalog language "eng".
- catalog publisher "Austin, Tex. : Southwest Educational Development Laboratory,".
- catalog subject "Education Research.".
- catalog subject "LB1028 .S6842".
- catalog subject "Teaching Aids and devices.".
- catalog title "Calipers : planning the systems approach to field testing educational products / developed by the Southwest Educational Development Laboratory.".
- catalog title "Planning the systems approach to field testing educational products.".
- catalog type "text".