Samuel Hahnemann, sein Leben und Schaffen. 2 vols.

A standard work on the development of homeopathy and the life of Hahnemann. Digital facsimile of the 1922 German edition from the Hathitrust at this link. The work was translated into English as Samuel Hahnemann, His life and Work, Based on recently discovered State Papers, Documents, Letters, &c. by Marie J. Wheeler and W.H.R Grundy, and edited by J. H. Clarke and F. J. Wheeler, London: Homoeopathic Publishing Company, 1922. Digital facsimile of the English translation from the Internet Archive at this link.