Columbia subject headings:
Engel, Marian--Correspondence.
MacLennan, Hugh, 1907-1990--Correspondence.
Harvard subject headings:
Authors, Canadian--20th century--Correspondence.
Engel, Marian--Correspondence.
MacLennan, Hugh, 1907-1990--Correspondence.
Princeton subject headings:
Authors, Canadian--20th century--Correspondence.
Engel, Marian--Correspondence.
MacLennan, Hugh, 1907-1990--Correspondence.