These indicate the repeater sites for the WMNF system. 171.525 is the repeater output. That will hear all the repeaters you can get in your area. The 123.0, 131.8, etc are PL tones that affect accessing each repeater. If your scanner does CTCSS, you may be able to separate or identify which repeater the user is on. However, the main thing to have in your scanner is 171.525.