The Cone Sisters of Baltimore: Collecting at Full Tilt - Ellen B. Hirschland, Nancy Hirschland Ramage - Google Books

http://books.google.de/books?id=am0keDuFAZQC&pg=PA53&lpg=PA53&dq=Vallotton+gertrude+Stein+Picasso&source=bl&ots=ky2Y6RalCL&sig=0

Over a period of fifty years, sisters Claribel and Etta Cone amassed one of the most acclaimed collections of late-nineteenth and twentieth-century art in America. Dr. Claribel and Miss Etta were two halves of an idiosyncratic team—Claribel bold and…