This guide provides direct links and pointers for locating variety trials (or performance tests) for specific field crops in Iowa, both past and present. It also provides locations and call numbers for the ISU Library.
This book provides a fascinating snapshot-in-time account of the productivity status of all major U.S. field crops. Each crop has a different story to tell. Each chapter is devoted to a specific crop.
Yield Gains in Major U. S. Field Crops by 
