I found this site while looking at some designs for some out buildings I'm thinking about, i found this site. Some good stuff on here.
http://www.ag.ndsu.edu/extension-aben/buildingplans
I also ran across this bunker design.
http://www.ag.ndsu.edu/aben-plans/5950.pdf
And this for an animal shelter. I also saw the same design set up as an earth-bermed green house, with some mods done to it..
http://www.ag.ndsu.edu/aben-plans/b712.pdf
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