• publisher: Urbana, University of Illinois
  • creator: Streitz, Ruth, 1892-1984
  • Keyword: Arithmetic Study and teaching.
  • years: 1924.
  • pages: 34 p., 2 l.
  • class: LB1589
  • notes: On cover: University of Illinois bulletin. vol. xxi, no. 34.
  • download: pdf file