Columbia subject headings:
Harvard subject headings:
Authors, German--20th century--Correspondence
Bellmann, Johann D. (Johann Diedrich)--Correspondence.
Low German literature--20th century--History and criticism--Sources.
Pohl, Heinz Werner, 1929---Correspondence.
Princeton subject headings:
Bellmann, Johann D. (Johann Diedrich)--Correspondence.
Low German literature--20th century--History and criticism.
Pohl, Heinz Werner, 1929---Correspondence.