From the number of volumes planned we may conclude that Virchow was one of the most prolific of all physicians. According to the Wikipedia article on Christian Andree, to which I have linked, volumes in this set were published by Peter Lang from 1992 to 1997, by Blackwell from 1999 to 2001, by Langen Müller in 2002, by Königshausen & Neuman in 2002, by Blackwell in 2003, and by Olms from 2005 to 2015. An Olms brochure which was available online when I wrote this entry in January 2020 indicated that Vols.1-29 would concern Medicine, Vols. 30-41 Politics, Vols. 42-58 Anthropology including Prehistory, Vols. 55 to 71 letters between Virchow and his contemporaries. In January 2020 it appeared that most, but not all, of the planned volumes were published.