Columbia subject headings:
Ehlers, Alice, 1887-1981--Correspondence.
Harpsichordists--Correspondence.
Organists--Correspondence.
Schweitzer, Albert, 1875-1965--Correspondence.
Harvard subject headings:
Ehlers, Alice, 1887-1981--Correspondence.
Harpsichordists--Correspondence.
Organists--Correspondence.
Schweitzer, Albert, 1875-1965--Correspondence.
Princeton subject headings:
Ehlers, Alice, 1887-1981--Correspondence.
Harpsichordists--Correspondence.
Organists--Correspondence.
Schweitzer, Albert, 1875-1965--Correspondence.