The Knovel四种免费参考书

  Knovel现正为全球各大学、研究所提供四种与化学相关的参考书免费使用――
  访问方式:通过因特网访问,用户需自付国际网络通信费

Knovel ChemEssentials
 4 Free Chemistry References for Academe

International Critical Tables of Numerical Data, Physics, Chemistry and Technology

Knovel Critical Tables

Smithsonian Physical Tables (9th Revised Edition)

Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables