- Mason Bros. & Co
- c. 1910
- University of Illinois at Urbana-Champaign, University Library
Colored postcards. Caption on back reads: ""The largest private library in America. Now contains over 100,000 volumes with a capacity of 500,000. It has one and one forth acres floor space; sixty-one flights of stairs, with over 12,000 square feet of glass floors. Owns the private library of George Washington and valuable works of art. Located No. 10 Beacon Street. Library Postcards. Massachusetts. Hand colored photograph. 14.1 x 8.9 cm.
- Boston, Massachusetts