Columbia subject headings:
History--Philosophy.
Lessing, Gotthold Ephraim, 1729-1781--Philosophy.
Ontology.
Reason.
Harvard subject headings:
History--Philosophy
Lessing, Gotthold Ephraim, 1729-1781.
Ontology.
Reason.
Princeton subject headings:
Lessing, Gotthold Ephraim, 1729-1781--Criticism and interpretation.