Columbia subject headings:
Geometry--Congresses.
Maxwell equations--Congresses.
Maxwell, James Clerk, 1831-1879.
Nonlinear theories--Congresses.
Harvard subject headings:
Geometry--Congresses
Maxwell equations--Congresses.
Maxwell, James Clerk, 1831-1879
Nonlinear theories--Congresses.
Princeton subject headings:
Geometry--Congresses.
Maxwell equations--Congresses.
Maxwell, James Clerk, 1831-1879.
Nonlinear theories--Congresses.