There are quite a few great resources, and just interesting reads for those interested in being self sufficient.
Being in Minnesota, we appreciate these two authors that live in Maine and understand the issues of short season gardening
The Garden Primer - by Barbara Damrosch (she has a new addition coming June 2015)
Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long - by Eliot Colman and Barbara Damrosch
The Winter Harvest Handbook: Year Round Vegetable Production Using Deep Organic Techniques and Unheated Greenhouses - By Eliot Coleman and Barbara Damrosch
Mother Earth News