A Day with Picasso - Billy Klüver - Google Books

https://books.google.de/books?id=SfhxxjUrXKAC&pg=PA45#v=onepage

In 1978, while collecting documentary photographs of the artists' community in Montparnasse from the first decades of the century, Billy Klüver discovered that some previously unassociated photographs fell into significant groupings. One group in…