• publisher: Yonkers-on-Hudson, N.Y., World book company
  • creator: Mead, Cyrus De Witt, 1875-
  • Keyword: Arithmetic Study and teaching. Educational tests and measurements
  • years: 1917.
  • pages: xiv p., 1 l., 54 p.
  • class: QA135
  • download: pdf file