(Bull Run Restaurant, 72', 1971, 21-09-G) across Mulpus Brook behind the Bull Run Restaurant WNW of Ayer, Shirley Township, Middlesex County, MA. MA2A W. 3.4 miles from jct with MA111 just N. of Ayer to the restaurant on the N. side of the road just W. of Longley Rd. (5-19-02, N42 35.08 W71 38.77) Photo by Dan Brock.