Der Blaue Reiter.
The Blue Rider. Publisher's announcement / illustrated prospectus. Mchn., R. Piper, (1912). 4 p. with 6 ill. 29.2:21.7 cm.
Published as a supplement in "Kunst und Künstler", Jg. 10, H. 7, April 1912. - Describes and justifies the Blaue Reiter, published in three different editions, today probably rarer than the advertised main issue.
