Columbia subject headings:
Harvard subject headings:
Germans--Togo--Correspondence.
Johnson, Adolf Kodjovi, 1888-1984--Correspondence.
Küster, Emma--Correspondence.
Küster, Gustav--Correspondence.
Togo--Biography.
Princeton subject headings:
Johnson, Adolf Kodjovi, 1888-1984--Correspondence.
Küster, Emma.
Küster, Gustav.
Togo--Biography.