i. 9 July 1839 - Berlin - Acknowledges books and plants from Bentham. Orchids. Esenbeck. Publications. (German).
ii. 12 August 1844 - Berlin - Payments and letter for him.
i. 9 July 1839 - Berlin - Acknowledges books and plants from Bentham. Orchids. Esenbeck. Publications. (German).
ii. 12 August 1844 - Berlin - Payments and letter for him.