Steinitz, William Chess Match Between Steinitz & Blackburne: Played at the West End Chess Club, London, February 17 to March 2, 1876

Stewart-Brown, Ronald Isaac Greene, a Lancashire Lawyer of the 18th Century, With the Diary of Ireland Greene (Mrs. Ireland Blackburne of Hale) 1748-9

Blackburne, Harold S Position Finding by the Improved Sumner" Method: Contrasted With the New ...

Blackburne, Harold S. Tables for Azimuths, Great-Circle Sailing, and Reduction to the Meridian, With a New and Improved "Sumner" Method: Latitudes 900 N. to 900 S., ... With Numerous Examples of Double Altitudes