Things you find on Wikipedia
It seems that there is a Wiki page for everything.
Like
this one:
Crystal oscillator frequencies
Crystal oscillators can be manufactured for oscillation over a wide range of frequencies, from a few kilohertz up to several hundred megahertz. Many applications call for a crystal oscillator frequency conveniently related to some other desired frequency, so hundreds of standard crystal frequencies are made in large quantities and stocked by electronics distributors. Using frequency dividers, frequency multipliers and phase locked loop circuits, it is practical to derive a wide range of frequencies from one reference frequency.
Posted by DaveH at May 29, 2013 10:28 AM