These charts are intended to let you calculate your crystal frequency yourself, should you desire to. Otherwise, if you call a crystal vendor, like Bomar Crystal, International Crystal Manufacturing, Jan Crystal, Marden, etc., you can simply give them the part number of the channel element (PL19A129393Gsome letter), the frequency you want, and whether it is for transmit or receive, and they will do the calculations and mail you the crystals. This way, if there should be a problem with the crystal frequency, it's their problem, not yours.