Sears, Rilco, Montgomery Ward barn kits

I am in need of information on the the old mail order barn kits that were available back years ago, 1900 - 1960's. I am a high school ag teacher and am preparing a presentation to one of my shop classes of various historical barn designs and I know that several of these wer used widely. The Rilco's had several different types, including dairy, machinery, horse barns, and others. I had seen their ads in old Farm Journals and Successful Farming magazines from the '50s. Looking for old diagrams/ pictures/ photocopies. E-mailed scanned copies would be great. I am making a powerpoint presentation to use this year and for future use. Any info you could give would be greatly appreciated. Thanks

casey