Dear Ms. Snark,
I found an agency and, within that agency, found the particular agent who represents my type of work (young adult).
1. The agency website and (more reliably) the 2007 Writer's Market list two different addresses to send queries to -- in different states. I don't know which address this agent would be at, though there are phone numbers I could call to try and find out.
2. The agency's information says to send any non-nonfiction query to a man who doesn't represent what I write (he does sci fi, sports, & literature).
Do I ignore the directions to "send all other snail mail queries to E.S. in Texas" and go ahead and find out where Ms. Represents My Stuff works? Or do I play it their way?
I've said it before, I'll say it again: follow the damn directions.
We are NOT trying to confuse you. We are NOT trying to trick you. We are trying to HELP you get your work to the person who is supposed to see it. Our entire livelihood depends on finding good writing. We're looking for it, and we tell you how to send it so we get it.
Follow the damn directions.