My and OldPilot's point was that Gary already had access to what he wanted, not that a NRST ARTCC list is undesirable.
But ... what circumstances cause you guys to need to look up frequencies? Your initial callup freq is available in the departure airport information (for home airport you probably have it memorized) and after that ATC gives you the freqs as you progress from controller to controller or from repeater to repeater. They even give you the tower frequency when they drop you and you're headed to a towered airport. I can't remember the last time I had to look up a Center or TRACON frequency, FF or IFR. CTAFs, yes; I don't think ATC has ever given my one of those. But Center? I don't get it.