Smithsonian InstitutionThe William Steinway Diary: 1861-1896
Steinway & Sons Records and Family Papers, Archives Center, National Museum of American History
Inserted slip in William's hand. William wrote "Bowery Bay Bld + Improvement Co April 30" on a piece of paper and used it as a bookmark to indicate this significant entry related to the founding of the Bowery Bay Building & Improvement Company.