Columbia subject headings:
Harvard subject headings:
Darwin, Charles, 1809-1882. Correspondence
Dohrn, Anton, 1840-1909--Correspondence.
Naturalists--England--Correspondence.
Zoologists--Germany--Correspondence.
Princeton subject headings:
Darwin, Charles, 1809-1882. Correspondence.
Dohrn, Anton, 1840-1909--Correspondence.
Naturalists--Correspondence.