Keen, W. W. 1. (1909). An account of the festival held at Upsala, May, 1907, in commemoration of the 200th anniversary of the birth of Carolus Linnaeus. Brooklyn, N.Y.: [publisher not identified].

Keen, William W. 1837-1932. An Account of the Festival Held At Upsala, May, 1907, in Commemoration of the 200th Anniversary of the Birth of Carolus Linnaeus. Brooklyn, N.Y.: [publisher not identified], 1909.

Keen, William W. 1837-1932. An Account of the Festival Held At Upsala, May, 1907, in Commemoration of the 200th Anniversary of the Birth of Carolus Linnaeus. Brooklyn, N.Y.: [publisher not identified], 1909.