Charles Nordhoff, Communistic Societies of the United States (New York: Harper & Bros., 1875). This is a history of utopian communities in the U.S. in the late 19th Century, with a wonderful description of the Amana colonies. (Good drawings of Amana, too.) The chapter on Amana is about 30 pages long and very useful.
https://archive.org/details/communistsocieties00nordrich/page/30