Bees and Cover Crops, SARE, Penn State University (PDF)
Cover Crop Chart (color images, slide-ready), Agricultural Research Service, USDA
Cover Crops and Pollinators, NRCS/USDA
Cover Cropping for Pollinators and Beneficial Insects, SARE
Farming for Bees, The Xerces Society
Organic Farming Practices, The Xerces Society