#1 Robert Barr (1849-1912) was the Scottish-Canadian writer described in CK above. #2 Robert Barr (1909-1999) was the reporter and TV writer/producer who wrote Dark Island.
1) Barr, Robert, 1850-1912. The triumph of Eugène Valmont,
2) Barr, Robert. The dark island
3) Robert BARR, Rev. of Capetown.The Trees Speak of Him