AGR (agr) = alt.gathering.rainbow, a Usenet newsgroup. If your internet service includes newsgroups, you can access it by simply subscribing to the newsgroup alt.gathering.rainbow. If you prefer, or if you don't have access to newsgroups, you can subscribe to the email gateway by following these directions. You can also read it using Google.
LEO = Law enforcement officer.
FS = Forest Service (usually USFS).