stations

I was looking at the Sacramento County (CA) wiki page (Sacramento County (CA) - The RadioReference Wiki) and have some questions. First, why did stations 9, 52 and 107 close? I'm guessing budget cuts? Second, why are some stations numbers skipped (33-34, 39-40, 43-44, 47-49, 67, 69, 79-80, 82...

ive become interested in hunting down numbers stations that play over the shortwave frequencies. ive managed to capture a few, like the backwards music station, and a spanish lady speaking numbers through internet controlled radios. what id like to do is by a cheap receiver (anywhere from 20-50...