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- 31006578 contributor B767737.
- 31006578 contributor B767738.
- 31006578 created "[c1931]".
- 31006578 date "1931".
- 31006578 date "[c1931]".
- 31006578 dateCopyrighted "[c1931]".
- 31006578 description "Bibliography: p. 25-26.".
- 31006578 extent "26 p.".
- 31006578 isPartOf "The Catholic University of America. Educational research bulletins, v. 5, no. 8".
- 31006578 issued "1931".
- 31006578 issued "[c1931]".
- 31006578 language "eng".
- 31006578 publisher "Washington, D.C., The Catholic Education Press".
- 31006578 subject "372.7 [511.07]".
- 31006578 subject "Arithmetic Study and teaching.".
- 31006578 subject "QA135 .R73".
- 31006578 title "A comparison of studies on the relative difficulty of the number combinations [by] Robert T. Rock, Jr., and T. G. Foran.".
- 31006578 type "text".