This book gives instructions for the Biointensive method of gardening, which supposedly allows you to grow all the food a person needs in a very small space, sustainably (including all the material you'll need for creating sufficient compost). Even if your goals are not that ambitious, this is a very informative book for any vegetable gardener. The basic techniques are double digging and adding lots of compost, to create a light, rich, friable soil, and very close spacing of plants to create a "living mulch" -- a microclimate in which plants will excel and weeds will be suppressed. Seeds are also started ahead of time in flats, for maximum use of garden space. I've used these methods on part of my small garden with very good results. The extra work preparing the soil pays off in the end with less weeding to do. This book also has some of the most detailed information about techniques that I have seen in any garden book. For example, a technique of digging is described that minimizes disruption of the soil layers and structure.
I have the 1991 edition. Although I gave up double-digging a few years ago, I still use this book every year to space the veggies in my 2-person garden for maximum yield. The charts are invaluable for anyone wishing to grow their own and maximize the yield while minimizing the work, either on a large or a limited scale.
John Jeavons has contributed substantially to research on how an increasing number of people on the planet can feed themselves economically without causing damage to the earth that sustains them.