Organic Gardener's Composting, Steve Solomon, at gutenberg.org, www.gutenberg.org/ebooks/4342 (multiple formats) Amazon Kindle, http://www.amazon.com/Organic-Gardeners-Composting-ebook/dp/B004TS8ZFG

 Gardening without Irrigation: or without much, anyway, Steve Solomon, http://www.gutenberg.org/ebooks/4512 (multiple formats) Amazon Kindle, http://www.amazon.com/Gardening-Without-Irrigation-without-ebook/dp/B0082VKRXO

 A Beginner's Guide to Companion Planting: Companion Gardening with Flowers, Herbs and Vegetables, Mel Jeffreys, http://www.amazon.com/Beginners-Guide-Companion-Planting-ebook/dp/B00BLYAWAM/ref=sr_1_9?s=books&ie=UTF8&qid=1374070205&sr=1-9&keywords=companion+plants

Sustainable Agriculture Research and Education (SARE) offers some free, downloadable books and documents about cover crops, their benefits and how to manage them. The site also contains numerous papers, books and videos regarding innovation in sustainable agriculture. Following are links to several publications about cover crops.

 Cover Crops, a topic brief, SARE, http://www.sare.org/Learning-Center/Topic-Rooms/Cover-Crops

 Building Soils for Better Crops, 3rd Edition, SARE, http://www.sare.org/Learning-Center/Books/Building-Soils-for-Better-Crops-3rd-Edition

 Managing Cover Crops Profitably, SARE, http://www.sare.org/Learning-Center/Books/Managing-Cover-Crops-Profitably-3rd-Edition