Columbia subject headings:
Harvard subject headings:
Energy-band theory of solids--Congresses.
Free electron theory of metals--Congresses.
Ultraviolet spectroscopy--Congresses.
X-ray spectroscopy--Congresses
Princeton subject headings:
Energy-band theory of solids--Congresses.
Free electron theory of metals--Congresses.
X-rays--Spectra--Congresses.