Out on Dulaney Valley Road at Dance Mill Road, a yellow school bus turns into a narrow road. In minutes, the school children-- as thousands did before and after —disembark. They have come this day in 1955 to Cloverland Farms—to see cows milked! But in 1981 the milking barn closed---leaving subsequent generations of children believing, this story goes, that maybe chocolate milk comes from brown cows.