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Investigations in pre-algebra
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- http://id.loc.gov/authorities/subjects/sh85082166
- http://id.loc.gov/authorities/subjects/sh2007100988
- http://id.worldcat.org/fast/1012305
- http://id.loc.gov/authorities/subjects/sh2007100985
- http://id.worldcat.org/fast/1012163
- http://id.worldcat.org/fast/804904
- http://id.worldcat.org/fast/804885
- http://id.loc.gov/authorities/subjects/sh85082154