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         Abacus:
  1. Learn Colors (Abacus Books) by Sarah Hewetson, Amanda Bartlett, et all July, 1995
  2. Number Machines: An Introduction to the Abacus, Slide Rule and Pocket Calculator by Forrest M. Mims, April, 1977
  3. Learn Numbers (Abacus Books) by Sarah Hewetson, Amanda Bartlett, et all July, 1995
  4. Abacus Early Years: Teachers' Resource Book (Abacus) by Ruth Merttens, David Kirkby, 20 May, 1997
  5. The Abacus: Its History, Its Design, Its Possibilities in the Modern World by Parry Hiram Moon, June, 1971
  6. New Abacus 1: Activity Book (New Abacus) by Ruth Merttens, David Kirkby, 20 April, 1999
  7. New Abacus 2: Number Textbook (New Abacus) by Ruth Merttens, David Kirkby, 01 January, 1999
  8. New Abacus 5 Replacement Teaching Kit (Scotland) (New Abacus) by Ruth Merttens, David Kirkby, 17 August, 1900
  9. New Abacus 5: Replacement Half Form Kit(England And Wales) (New Abacus) by Ruth Merttens, David Kirkby, 17 August, 1900
  10. PC Bios: Improve and Upgrade Your PC'S Computing Power! by Heinz Lange, Abacus Publishing, et all March, 1900

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