General Website
http://www.nul.org/youngprofessionals.html
Baltimore Area
http://www.bul.org/
I didn't see a link for a YP site in Baltimore, but there's a contact page if you want to get in touch with someone.
ETA: The general site [
http://www.nul.org/ulypchapters.html ] has the contact information for the Baltimore YP director.