Obituary for Otto ABRAHAMSON (Aged 78) - Newspapers.com
The Master of Mary of Burgundy by Otto Pächt - 1948
Otto Klein Jr. to Marry Miss Mary J. Cameron - The New York Times
The Album: Rinehart, Mary Roberts, Penzler, Otto: 9781613163610: Amazon.com: Books
Buffalo Address Book and Family Directory 1896-1897 - Buffalo History Museum - Buffalo Address Book and Family Directory - New York Heritage Digital Collections