The Nashville Public Library will be closed today for the Martin Luther King, Junior holiday.  Regular library hours are Mondays through Fridays from 10 AM to 7 PM and Saturdays from 10 AM to 2 PM.  The U.S. Postal Service will observe the federal holiday honoring the anniversary of the birth of noted civil rights leader Dr. Martin Luther King, Junior today.  Post Offices across Central and Southern Illinois will be closed and there will be no mail delivery.  Mail will be collected from blue street collection boxes today though.  Post Offices will reopen and mail delivery will resume on Tuesday.