15 Proven Plans for Market Farms on 5 Acres or Less. By Josh Volk. Learn how to harness an area's water supply, orientation and geography in order to maximize efficiency and productivity. Come along on a tour of 15 successful farms, from urban rooftops to rural retreats, all flourishing on five acres of land or less. Full color, photos and illustrations throughout. 240 pages. 10 X 8 inches. Softcover.