Popular Science magazine has been published for 137 years. Now, every issue ever produced has been scanned and posted the archives at their website, at no charge.
While it is a great resource for science buffs, it also will appeal to genealogists and historians. Those advertisements will provide great insight into changing life styles over the years. Want to see what great-grandpa and great-grandma used to cook their food or to heat the house? You probably will find ads and even pictures of these "conveniences" online at the Popular Science magazine web site. Start at http://www.popsci.com/announcements/article/2010-03/new-browse-137-years-popsci-archive-free.