The callsign in the database "License" column links to the license data from the FCC.
At the bottom of the license page there is a link to "FCC ULS Listing for this callsign" which links to the FCC web site and is the source for the data.
If other frequencies listed on a license don't show up in the database it's because they haven't been submitted.
There are several reason for that. Maybe they are in located in another county or state. Maybe they aren't really used even though they are licensed. Maybe new frequencies were added to the license recently. Maybe the callsign entered in the database is a typo and links to the wrong license. Maybe nobody in your area was smart enough to look up all the the licenses, identifiy active use and submit the information.
If you know they are active and can verify use then submit them.
As ND5Y notes, if it's on the license but not in the RR database, it hasn't been confirmed active and submitted by an RR member. RadioReference does not list frequencies which have not been confirmed active and submitted as such, in order to keep the database as accurate as possible.
In addition, there are other reasons many of these frequencies may not be in the database (or may not be visible):
1. Repeater inputs. On your county page, just above the frequency listings, you'll see a pull-down box labeled Input Frequencies. This defaults to "Hidden" but if you change it to "Shown" you'll see the repeater input frequencies associated with repeater output frequencies;
2. Directional links or data frequencies which aren't easy to receive and thus not easy to confirm;
3. Frequencies actually used by another agency, but licensed to the agency you're looking at for interoperability purposes. We do not list frequencies of this type in order to eliminate unnecessary duplicates from the database.
(At one time it was required that agencies be licensed for any frequency they intended to transmit on, their own or those of a neighboring agency. However, several years ago the FCC removed this requirement, and allowed agencies to simply obtain a letter of permission from the primary license holder to use the frequency for interoperability.)
Hope this helps.
