| 21. 
  |  | Title: A Field Guide to Bird Songs: Eastern and Central North America (Peterson Field Guides) by Cornell Laboratory of Ornithology, Roger Tory Peterson
 ISBN: 0618225943
 Publisher: Houghton Mifflin
 Pub. Date: 01 April, 2002
 List Price: $20.00
 Amazon.com Price: $14.00
 | 
| 22. 
  |  | Title: A Field Guide to Trees and Shrubs : Northeastern and north-central United States and southeastern and south-central Canada (The Peterson Field Guide Series) by George A. Petrides, Roger Tory Peterson
 ISBN: 039535370X
 Publisher: Houghton Mifflin
 Pub. Date: 06 September, 1973
 List Price: $19.00
 Amazon.com Price: $13.30
 | 
| 23. 
  |  | Title: What Men Won't Tell You but Women Need to Know by Bob Berkowitz, Roger Gittines
 ISBN: 0380713640
 Publisher: Avon
 Pub. Date: 01 August, 1991
 List Price: $5.99
 Amazon.com Price: $5.99
 | 
| 24. 
  |  | Title: A Field Guide to Reptiles & Amphibians of Eastern & Central North America (Peterson Field Guide Series) by Roger Conant, Joseph T. Collins, Isabelle Hunt Conant (Artist), Tom R. Johnson (Artist), Suzanne L. Collins (Photographer)
 ISBN: 0395904528
 Publisher: Houghton Mifflin Co
 Pub. Date: 15 May, 1998
 List Price: $21.00
 Amazon.com Price: $14.70
 | 
| 25. 
  |  | Title: Gestures : The Do's and Taboos of Body Language Around the World by Roger E.  Axtell
 ISBN: 0471183423
 Publisher: Wiley
 Pub. Date: 10 October, 1997
 List Price: $16.95
 Amazon.com Price: $11.87
 | 
| 26. 
  |  | Title: The People's Guide to Mexico (PEOPLES GUIDE TO MEXICO) by Carl Franz, Lorena Havens, Steve Rogers
 ISBN: 1566914345
 Publisher: Avalon Travel Publishing
 Pub. Date: 01 August, 2002
 List Price: $22.95
 Amazon.com Price: $16.07
 | 
| 27. 
  |  | Title: Quick Guide to the 16 Personality Types in Organizations: Understanding Personality Differences in the Workplace by Linda V. Berens, Sue A. Cooper, Linda K. Ernst, Charles R. Martin, Steve Myers, Dario Nardi, Roger R. Pearman, Marci Segal, Melissa A. Smith
 ISBN: 0971214417
 Publisher: Telos Publications
 Pub. Date: 15 February, 2002
 List Price: $8.95
 Amazon.com Price: $8.95
 | 
| 28. 
  |  | Title: Diffusion of Innovations, 5th Edition by Everett M. Rogers, Everett Rogers
 ISBN: 0743222091
 Publisher: Free Press
 Pub. Date: 16 August, 2003
 List Price: $35.00
 Amazon.com Price: $35.00
 | 
| 29. 
  |  | Title: The Great Book of Amber: The Complete Amber Chronicles, 1-10 (Chronicles of Amber) by Roger Zelazny
 ISBN: 0380809060
 Publisher: Eos
 Pub. Date: 08 December, 1999
 List Price: $22.95
 Amazon.com Price: $16.07
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| 30. 
  |  | Title: A Field Guide to Insects by Richard E. White, Donald J. Borror, Roger Tory Peterson
 ISBN: 0395911702
 Publisher: Houghton Mifflin Co
 Pub. Date: 15 April, 1998
 List Price: $19.00
 Amazon.com Price: $13.30
 |