Landolt-Bornstein is the best reference source for physical and chemical data.

Updated on a quarterly basis, SpringerMaterials includes:

• 400 Landolt-Börnstein volumes, 250,000 substances and 1,200,000 citations
• 44,000 Chemical Safety Documents
• The world's largest Database on Thermophysical Properties, the subset of the DDBST (Dortmund Data Bank Software & Separation Technology)
• Linus Pauling Files, includes the most comprehensive database on inorganic solid phases

Access is restricted to UCB faculty, staff, and students.