On 1-Oct-2003, John wrote:

How are we supposed to know the approach frequencies and their
limitations, if not on the chart?

What I do is look on an approach chart for a nearby airport. Approach
frequencies are shown (or Center frequencies if they handle approaches
there). If it's not also the frequency to use for local VFR handling they
should be able to tell you which one is.

--
-Elliott Drucker