plant spacing guides

I am new to this forum and have not yet found a complete guide for plant-square allocation. I have Mel's book there are charts through out the book however incomplete. Does anyone have a place where all plants (vegatables) are listed?

Pepper -

Most people use the "thin to" advice for the particular plant, if it's not listed.

Thin to:
12 inches = 1 per sq ft
6 inches = 4 per sq ft
4 inches = 9 per sq ft
3 inches = 16 per sq ft

Nice to have you here!

thank you

This is good information to know. So if I am planting transplants I would get a seed pack to find the 'thin to' numbers. Cool thanks again

Another idea would be to post the vegetables you're wondering about and get some feedback from people that have done them.
Some examples of one to a square would be brocolli, cabbage, cauliflower, brussels sprouts, tomatoes (staked and pruned), cucumbers (staked) possibly peppers (I'm doing one per square, as I will be surrounding each one with a wall-a-water.
Some examples of two per might be celery, as it takes up a lot of nutrients and the root system is fairly large or turnip "greens" (seven top is one variety grown for greens and not the root)
Four per square would include lettuces, bush beans (some people do more per), pole beans (some people do more) Elephant garlic
Eight or nine per could include peas, beets, onions that you want to bulb up (although I'd probably plant 16 and then thin them as scallions as they grew), hardneck or softneck garlic, leeks.
Sixteen per would be carrots, onions (scallions)

This is just what I can think of off the top of my head. Others might have other suggestions.
As Boffer mentioned, you can utilize the squares with crops like brocolli that take some time to get big enough to need their entire square by putting 4 lettuce in the same square (near the corners), or scallions between the plants. Just don't put incompatible plants next to one another (onions with beans/peas).
You will probably need to experiment a little the first year or so to figure out how you need to tweak it to work best in your situation, but that's half the fun.