I'm still messing around with geolookup and I've noticed that most of the stations returned by geolookup only started uploading data within the last 6 months. i.e. not many of them have data from 2 or more years ago. The simple explanation is that just aren't that many "old" stations on the PWS network. However, I'm wondering if geolookup (or the WU database which it is querying) has some filter on active or recently active stations. If my suspicion is correct, is there a way to find older, not currently reporting stations?