There are many different types of questions involving formulas. These are formulas which do not involve reference to physical properties or substances. Formulas of organic compounds are extremely numerous and may be very complex, involving rings, side chains, etc. Finding statistical data does not usually present problems beyond finding a source. Some requests pertaining to economic statistics of technologies fall beyond the scope and resources of this library.
Some requests concerning astrological calculations fall outside the scope of a science library.
In many cases the information needed to answer questions covered by this guideline is to be found in many alternative sources, and the choice of resources is mainly dictated by one's familiarity with the collections and subject matter. For this reason the following list of references only attempts to suggest some useful sources coordinated with the various problems treated above, and it is in no way exhaustive or sufficient for all of them. Not only scientific units, but also a comprehensive source of practical, local, ancient and obsolete units. Gives definitions of all types of quantities and measurement terms. CRC handbook of chemistry and physics.