Columbia subject headings:
Erdmann, Benno, 1851-1921.
Husserl, Edmund, 1859-1938.
Harvard subject headings:
Erdmann, Benno, 1851-1921
Husserl, Edmund, 1859-1938
Princeton subject headings:
Erdmann, Benno, 1851-1921.
Husserl, Edmund, 1859-1938.