Columbia subject headings:
Mackay, Isabel Ecclestone, 1875-1928--Bibliography--Catalogs.
Mackay, Isabel Ecclestone, 1875-1928--Manuscripts--Catalogs.
Manuscripts, Canadian--Ontario--Waterloo--Catalogs.
University of Waterloo. Library--Catalogs.
Harvard subject headings:
Mackay, Isabel Ecclestone, 1875-1928--Bibliography--Catalogs.
Mackay, Isabel Ecclestone, 1875-1928--Bibliography.
Mackay, Isabel Ecclestone, 1875-1928--Manuscripts--Catalogs.
Manuscripts, Canadian--Ontario--Waterloo--Catalogs.
University of Waterloo. Library--Catalogs.
Princeton subject headings:
Mackay, Isabel Ecclestone, 1875-1929--Bibliography--Catalogs.
Mackay, Isabel Ecclestone, 1875-1929--Manuscripts--Catalogs.
Manuscripts, Canadian--Ontario--Waterloo--Catalogs.
University of Waterloo. Library--Catalogs.