Columbia subject headings:
Le Roy, Eugène, 1836-1907--Congresses.
Le Roy, Eugène, 1836-1907--Criticism and interpretation.
Harvard subject headings:
Le Roy, Eugène, 1836-1907--Congresses.
Le Roy, Eugène, 1836-1907--Criticism and interpretation.
Princeton subject headings:
Le Roy, Eugène, 1836-1907--Congresses.
Le Roy, Eugène, 1836-1907--Criticism and interpretation.