Which vegetable garden plant...? Which vegetable garden plant will produce the most food per square...

Which vegetable garden plant will produce the most food per square foot in a short growing season such as we enjoy in medium Minnesota?
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I live surrounded by Mass and the veggies that do the best are...

Tomatoes
Beans/peas(bush,string,snap peas etc)
squash
cucumbers
Potatoes do well to...and they're fun to grow!
Urgent Tomato Question??!!??
Lucky you ! You can grow some fine cool weather vegetables.
Planting the Vegetable Garden
University of Minnesota Extension office
http://www.extension.umn.edu/distributio...

Scroll down going on for half channel and they provide a list for you.
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Answers:    I live in wisconsin and I grow a vegetable garden every year. The veggies that do best are:
tomatoes (especially cherry or plum)
beans
peas
radishes (these grow unadulterated fast and you can plant them contained by the early summer and rash fall)
spinach
brussel sprouts (these always do great and I return with a ton)
cucumbers
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Cucumbers, Tomatoes, Squash,
Where can I look online for Nurseries within...