1. 1
   The number combinations, their relative difficulty and the frequency of their appearance in text-books

   著者: Clapp, Frank L. (Frank Leslie), b. 1877
   出版事項 1924

   Madison, Wis. [1924]

   120 p. diagrs. 23 cm.

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2. 2
   The number combinations, their relative difficulty and the frequency of their appearance in text-books; a brief summary of study no. 1

   著者: Clapp, Frank L. (Frank Leslie), b. 1877
   出版事項 1924

   Madison, Wis. [1924]

   19 p. diagr. 23 cm.

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3. 3
   Elements of difficulty in the interpretation of concrete problems in arithmetic

   著者: Hydle, Lars Larson, 1885-
   出版事項 1927

   Madison, Wis. [1927]

   84 p. 23 cm.

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