The grey covers are badly rubbed, internally the book is in exceelnt condition. "Ella Bergmann-Michel (20 October 1896-8 August 1971) was a German abstract artist, photographer and documentary filmmaker. An early student of constructivist art in Germany, her contributions to modern abstract art are often forgotten in American art culture. Bergmann-Michel's style was very specialized and unique, especially considering the restrictive time in which she was actively working. Most of her work is not titled or signed, making it hard to identify and find in today's art market" (Wikipedia)