Third graders in Room 9 of Broad Street School in Butler mail their valentines early on Feb. 11, 1965, at a walk-in post office the class built. Each pupil had a box in the post office. From left are Harriet Hall, James Heath, John Clem, Dian Wahl, William Barger (acting as postmaster) and Wayne Foley. Miss Marion George was their teacher. Continuing the tradition, most students in Butler County schools are exchanging valentines this week.