Columbia subject headings:
Bernheim, Ernst, 1850-1942--Correspondence.
Historians--Belgium--Correspondence.
Historians--Germany--Correspondence.
Lamprecht, Karl, 1856-1915--Correspondence.
Pirenne, Henri, 1862-1935--Correspondence.
Harvard subject headings:
Bernheim, Ernst, 1850-1942--Correspondence.
Historians--Belgium--Correspondence.
Historians--Germany--Correspondence
Lamprecht, Karl, 1856-1915--Correspondence.
Pirenne, Henri, 1862-1935--Correspondence.
Princeton subject headings:
Bernheim, Ernst, 1850-1942--Correspondence.
Historians--Belgium--Correspondence.
Historians--Germany--Correspondence.
Lamprecht, Karl, 1856-1915--Correspondence.
Pirenne, Henri, 1862-1935--Correspondence.