In her new book “Erwin Blumenfeld: I Was Nothing But a Berliner, Dada Montages 1916-1933", Helen Adkins collects and annotates the little-seen dada colleges of Erwin Blumenfeld.  Although Blumenfeld was a famous and much sought-after fashion photographer, his colleges were mostly "given away as gifts and sent as letters" and are only being rediscovered now.