He published a book in 1929 called 'Face of Our Time' (links to Amazon) which forms the basis of his an exhibition of his work 'People of the 20th Century' The book was not well recived by the Nazi's who destroyed some of the plates and negatives. Sanders images were probably too 'transparent' in the kind of society they showed, not exactly the modern image of Germany the Nazi's wanted.
August Sander's style has influenced many of his later 20th Century contempoaries such as Lissette Model and Diane Arbus the latter especially.
The Book Face of our time is a must for any portrait photographers bookshelf.
©Photo Utopia 2012