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- catalog contributor b8996047.
- catalog contributor b8996048.
- catalog created "[c1931]".
- catalog date "1931".
- catalog date "[c1931]".
- catalog dateCopyrighted "[c1931]".
- catalog description "Bibliography: p. 25-26.".
- catalog extent "26 p.".
- catalog isPartOf "Catholic University of America. Educational research bulletins, v. 5, no. 8".
- catalog issued "1931".
- catalog issued "[c1931]".
- catalog language "eng".
- catalog publisher "Washington, D.C., The Catholic Education Press".
- catalog subject "372.7 [511.07]".
- catalog subject "Arithmetic Study and teaching.".
- catalog subject "QA135 .R73".
- catalog title "A comparison of studies on the relative difficulty of the number combinations [by] Robert T. Rock, Jr., and T. G. Foran.".
- catalog type "text".