• Managing Cover Crops Profitably, Handbook Series Book 9, Third Edition, 2007. This 244-page book is published by the Sustainable Agriculture Network with funding from the USDA Sustainable Agriculture Research and Education (SARE) program of the USDA-CSREES, Beltsville, Maryland.  Print copy for sale, or PDF can be downloaded free.
   

• Intercropping Winter Cereal Grains with Red Clover, PM 2025, 2006. Iowa State University Extension
   

• UC SAREP Cover Crop Database, searchable for more than 40 species used for cover crops, University of California, Sustainable Agriculture Research and Education Program, Davis California.
   

• Small Grain Cover Crops for Corn and Soybean, PM 1999. 2005. Iowa State University Extension.
   

• Alternative Field Crops Manual for Triticale. 1989. University of Wisconsin Cooperative Extension Service.
   

• Cover Crop Use in Crop Production Systems, NebGuide, G93-1146-A. Cooperative Extension, Institute of Agriculture and Natural Resources, University of Nebraska-Lincoln.
   

• Overview of Cover Crops and Green Manures, by Preston Sullivan. 2001. Appropriate Technology Transfer for Rural Areas (ATTRA), University of Arkansas, Fayetteville, Arkansas.
   

• Selecting the Best Cover Crop for Your Farm, by Marianne Sarrantonio, excerpted from Managing Cover Crops Profitably by the Sustainable Agriculture Network.
   

• 2005 Herbicide Manual for Ag Professionals, WC-92, Iowa State University Extension.
  
  Small Grain Production for Iowa--Winter, PM 1498. 1994. Iowa State University Extension.
   

• Small Grain Production for Iowa--Spring, PM 1497. 1994. Iowa State University Extension.
   

• The 2005 Guide for Weed Management in Nebraska, University of Nebraska Cooperative Extension, EC02-130-D.
   

• UC SAREP Cover Crop Resource Page, 2002. University of California, Sustainable Agriculture Research and Education Program, Davis California.

Other information on Leopold Center web site:

• Environmental benefits and management of small grain winter cover crops in corn-soybean rotations, Presentation that summarizes work in Iowa, developed by an Iowa group that includes Iowa State University, the Leopold Center, Practical Farmers of Iowa and the National Soil Tilth Laboratory. March 2007 [NOTE: File is 5.7 MB in size] 
   

• Cover crops in the Corn Belt: Survey finds underused potential as conservation tool, article from the Winter 2006-07 Leopold Letter newsletter
   

• Learn-as-you-go lessons about cover crops, article in Winter 2005 Leopold Letter newsletter