What is "landolt-bornstein"

Landolt–Börnstein is a systematic and extensive data collection in all areas of physical sciences and engineering published by Springer Science+Business Media. Originally, the project started with the first work published in 1883 by the physicist Hans Heinrich Landolt and the chemist Richard Börnstein. Currently Landolt–Börnstein includes more than 180,000 pages in 55,000 online documents. Besides, it offers 120,000 figures, more than 1 million literature references and 65,000 keywords to ease the direct access for users. Landolt–Börnstein also lists more than 72,000 element systems, 150,000 chemical substances, more than 530,000 substance-property pairs and nearly 1,5 million synonyms.