Part I. Farmers, Gene Banks, and Crop Breeding: Introduction and Overview; M. Smale, et al. 2. Definition and Measurement of Crop Diversity for Economic Analysis; E.C.H. Meng, et al. Part II: Valuation of Crop Genetic Resources Conserved Ex Situ. 3. The Cost of Conserving Maize and Wheat Genetic Resources Ex Situ; P.G. Pardey, et al. 4. Optimal Collection and Search for Crop Genetic Resources; D. Gollin, et al. 5. Crop Breeding Models and Implications for Valuing Genetic Resources; R.E. Evenson, S. Lemarie. Part III: Conserving Crop Diversity on Farms. 6. Farmers' Perceptions of Varietal Diversity: Implications for On-Farm Conservation of Rice; M.R. Bellon, et al. 7. Agronomic and Economic Competitiveness of Maize Landraces and In Situ Conservation in Mexico; H. Perales, et al. 8. Implications for the Conservation of Wheat Landraces in Turkey from a Household Model of Varietal Choice; E.C.H. Meng, et al. Part IV: Impacts of Crop Diversity on Productivity and Stability. 9. The Contribution of Genetic Resources and Diversity to Wheat Productivity in the Punjab of Pakistan; J. Hartell, et al. 10. Varietal Diversity and Yield Variability in Chinese Rice Production; D. Widawsky, S. Rozelle. 11. The Economic Impact of Diversifying the Genetic Resistance to Leaf Rust Disease in Modern Bread Wheats; M. Smale, R.P. Singh. Part V: Policies and Genetic Resource Utilization. 12. Intellectual Property Rights, Technology Transfer, and Genetic Resource Utilization; D. Zilberman, et al. 13. Enhancing the Diversity of Modern Germplasm through the International Coordination of Research Roles; G. Traxler, P.L. Pingali. 14. Achieving Desirable Levels of Crop Diversity in Farmers' Fields: Factors Affecting the Production and Use of Commercial Seed; M.L. Morris, P.W. Heisey. 15. Collaborative Plant Breeding as an Incentive for On-Farm Conservation of Genetic Resources: Economic Issues from Studies in Mexico; M. Smale, et al.