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| web | Benjamin Crowell | | 2020-05-16 |
| web | Benjamin Crowell | | 2020-05-07 |
| web | Benjamin Crowell | | 2019-11-08 |
| web | Benjamin Crowell | | 2019-05-22 |
| web | William Moebs, Samuel J. Ling,... | OpenStax | 2016-09-19 |
| web | Paul Peter Urone and Roger Hin... | OpenStax | 2012-06-21 |
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| web | Paul Flowers, Klaus Theopold, ... | OpenStax | 2019-02-14 |
| web | John S. Hutchinson | Connexions (Rice University) | 2013-10-07 |
| web | Timothy Soderberg | University of Minnesota | 2019-07-01 |
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| web | Mary Ann Clark, Jung Choi, and... | OpenStax | 2018-03-28 |
| web | | National Phenology Network | 2015-04-01 |
| web | Samantha Fowler, Rebecca Roush... | OpenStax | 2013-04-25 |
| web | J.Gordon Betts, Peter DeSaix, ... | OpenStax | 2013-04-25 |
| web | Martin R. Adams and Maurice O.... | | 2008-01-01 |
| web | N. A. Krasil'nikov | Academy of Sciences of the USS... | 1961-01-01 |
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| web | | UN Food and Agriculture Organi... | 2012-01-01 |
| web | G. Tyler Miller, Jr, and Scott... | | 2009-01-01 |
| web | Michael Allaby | | 2000-01-01 |
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| web | David L. Poole and Alan K. Mac... | | 2017-01-01 |
| web | | Wikibooks | 2013-03-15 |
| web | Don Johnson | OpenStax | 2008-08-06 |
| web | David MacKay | Cambridge University Press | 2005-03-01 |
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| web | Anthony Brandt and Robert McCl... | OpenStax | 2011-05-31 |
| web | Catherine Schmidt-Jones | OpenStax | 2007-01-01 |
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| web | Rose M. Spielman, William J. J... | OpenStax | 2020-04-22 |
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| web | Heather Griffiths, Nathan Keir... | OpenStax | 2017-01-01 |
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