Columbia subject headings:
Harvard subject headings:
Aquaculture--Germany--Biography.
Fishery scientists--Germany--Biography.
Herwig, Walther, 1838-1912.
Klosterkammer Hannover--Biography.
Princeton subject headings:
Aquaculture--Germany--Biography.
Fishery scientists--Germany--Biography.
Herwig, Walther, 1838-1912.
Klosterkammer Hannover--Biography.