Columbia subject headings:
Grimm, Walter O. (Walter Otto), 1894-1919--Exhibitions.
Watercolor painting--Germany (East)--Exhibitions.
Wood-engraving--Germany (East)--Exhibitions.
Harvard subject headings:
Grimm, Walter O. (Walter Otto), 1894-1919--Exhibitions.
Watercolor painting--Germany (East)--Exhibitions.
Wood-engraving--Germany (East)--Exhibitions.
Princeton subject headings: