International Conference on the Physics of X-Ray Spectra program and extended abstracts.

Mode of access: Internet.

Handbook of mammographic x-ray spectra /

Mode of access: Internet.

The complex broad-band X-ray spectra of Seyfert galaxies /

Cover: Laboratory for High Energy Astrophysics.

The extension of the X-ray spectrum to the ultraviolet ...

Reprinted from the Physical review n.s. v.18, no.6. Dec.1921.