FOUND IT!

This is the chart provided by the USDA on how much to plant (vegetables) per person. The info is copyright-free, by the way -- see Conditions of Use

You can print out the whole thing (it comes out in landscape form), and there's a form for you to customize your needs.

It gives estimates for
1. Need in pounds per person (fresh, and if preserving);
2. Length of row to plant per person;
3. Estimated yield per foot of row;
4. Amount of fresh produce (in pounds) needed to produce one canned or frozen quart.

And I'm sure you would want to plan for tree and bush fruits, nuts and herbs, too. Fruit trees come in grafted dwarfs, genetic dwarfs, semi-dwarfs, and standard sizes. Standards get too large for most smaller properties, so consider the smaller types (you'll have to do your homework for success).

Of course, you need to keep in mind that you might have crop failures for different reasons, so don't cut your estimates too fine. And if you can produce more than needed, you can use the produce for trade.

Sue