•Pilcomayo River Expedition. Letters dated 1889 -1890 to I.B. Balfour filed with I.B. Balfour correspondence under “Kerr, J.G.” Index page 97.
Sem título• Letter to Dr. Robert Wright regarding Orchids, dated 8 Sep.1832
•Copy of a typed letter [for I.B.B] from Dr. Masters, regarding having a memoir of Lindley prefacing one of ‘their’ volumes of the Annals of Botany (21 Jun 1903)