Pressure Units.

Atomic Units.

Energy Units.

Electron binding energies, in electron volts. (In PDF format)

Physical constants. (In PDF format)

Properties of the elements. (In PDF format)

Periodic Table of Elements. (In PDF format)

X-Ray Data Booklet

Database of Ionic Radii

Physics and Astronomy Classification Scheme (PACS)

Crystallography Open Database

Journal Titles and Abbreviations