Columbia subject headings:
Collineation.
Desarguesian planes.
Geometry, Affine.
Geometry, Projective.
Harvard subject headings:
Collineation.
Desarguesian planes.
Geometry, Affine.
Geometry, Projective.
Princeton subject headings:
Collineation.
Desarguesian planes.
Geometry, Affine.
Geometry, Projective.