| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| A Revolution Down on the Farm: The Transformation of American Agriculture since 1929 | 978-0-8131-2519-0 (0-8131-2519-7) | 2008 |
| The State of the Earth: Environmental Challenges on the Road to 2100 | 978-0-8131-2411-7 (0-8131-2411-5) | 2006 |
C.D. · C.P. · P. C. · P.P. · Paul C. · Paul Conkin · Paul D. · Paul P. · Ph.D.