Columbia subject headings:
Friendship.
Love.
Plato. Lysis.
Plato. Phaedrus.
Socrates.
Harvard subject headings:
Friendship.
Love
Plato. Lysis.
Plato. Phaedrus.
Socrates.
Princeton subject headings:
Friendship.
Love.
Plato. Lysis.
Plato. Phaedrus.
Socrates.