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| web | Lynn Marecek, Santa Ana Colleg... | OpenStax | 2020-04-22 |
| web | Lynn Marecek and Andrea Honeyc... | OpenStax | 2020-05-06 |
| web | Jim Hefferon | | 2020-04-26 |
| web | Stephen Boyd and Lieven Vanden... | Cambridge University Press | 2018-01-01 |
| web | Robert A. Beezer | University of Puget Sound | 2015-12-30 |
| web | Jay Abramson | OpenStax | 2015-02-13 |
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| web | Jay Abramson | OpenStax | 2015-02-13 |
| web | Carl Stitz, Ph.D. and Jeff Ze... | | 2013-07-04 |
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| web | Jiri Lebl | | 2020-06-10 |
| web | Gilbert Strang and Edwin “Jed”... | OpenStax | 2016-03-30 |
| web | William F. Trench | Trinity University | 2012-12-01 |
| web | David R. Guichard | | 2009-05-31 |
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| web | Barbara Illowsky and Susan Dea... | | 2013-09-13 |
| web | | Wikibooks | 2012-04-20 |
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| web | Oscar Levin | | 2019-12-29 |
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