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 |
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 |