PDFs
Cover Cropping for Success, University of Maine Cooperative Extension
Cover crops: rye, triticale, sorghum x sudangrass, millet, oats, annual ryegrass, medium red clover, alfalfa, field peas, hairy vetch, radish, mustard, rapeseed, buckwheat

Under Cover – Integrating Cover Crops into Silage Corn Systems, University of Vermont Extension
Cover crops: rye, triticale, oats, wheat, barley, annual ryegrass, red clover, white and alsike clovers, hairy vetch, radish, mustard, cover crop mixes

Spring Management of Overwintering Cover Crops – Don’t Wait!, Cornell University Cooperative Extension
Cover crops: rye, wheat, triticale, annual ryegrass, hairy vetch, radish, mustard, turnips

2010 Cover Crop Termination Trial, University of Vermont Extension
Cover crops: rye

2012 Cover Crop Termination and Reduced Tillage Trial, University of Vermont Extension
Cover crops: rye

Cover Crops for Conservation Tillage Systems, Penn State Extension
Cover crops: rye, oats, annual/perennial ryegrass, fescue, bluegrass, orchardgrass, bromegrass, timothy, crimson clover, red clover, white clover, hairy vetch, crown vetch, bird’s foot trefoil, field peas, radish, turnip, kale, rapeseed, buckwheat, mixes

Suppressing Weeds Using Cover Crops in Pennsylvania, Penn State Extension
Cover crops: rye, wheat, oats, red clover, hairy vetch, forage radish

Making the Most of Mixtures, Penn State Extension
Cover crops: mixes

Links to external websites
Special Cover Crop Control Considerations, Penn State Extension
Cover crops: wheat, annual ryegrass, red clover, white clover, hairy vetch, crimson clover, canola

Cover Crops that Did Not Winter Kill, University of Delaware Cooperative Extension
Cover crops: oats, mustards, radishes

Early Spring, Cornell University Cooperative Extension
Cover crops: rye, annual ryegrass, medium red clover, radish, mustard, turnips, mixtures

Cover Crop Rollers for Northeastern Grain Production, Penn State Extension
Cover crops: rye, hairy vetch

Strip Till, Biological Strip-Till and No-Till Systems Using Cover Crops for Seedless Watermelon Production, University of Delaware Extension
Cover crops: rye, crimson clover, hairy vetch, radish