eFunda stands for "engineering fundamentals." This site provides a wide variety of reference data on materials, processes, conversions, formulas, and calculators.
Critical data on inorganic and organic compounds and pure substances. Features physical, thermodynamic, mechanical, and other key properties. Originally published from 1926-1930 for the National Research Council, now available in full-text searchable electronic format.
Originally published by Smithsonian Institution Press in 1954, this classic reference source comprises 901 tables of general interest to scientists and engineers, and of particular interest to those involved with physics in its larger sense.