Perhaps not controversial, but I like to study / read old 19th century school texts; the Ray's Arithmetic series (which includes algebra, geomety, and more), McGuffey Readers, U.S. History texts by Eggleston and by Alexander Stevens, other geometry texts, etc. There are a couple of really neat web sites for someone such as myself who likes to indulge in this pursuit. Add to that the utopian literature of the 1890s and various utopian experimental communities throughout the 19th century.