Ayer sheets with Boston and Maine RR Trackage 
Roughly in order, West to East
 
1887 Maps 
 2
 1
 
1892 Maps 
 1
 2-3
 
1897 Maps 
 4
 2-3
 1
 
1902 Maps 
 3
 1-4
 5
 
1912 Maps 
 7
 4
 2-5-7
 6
 
1921 and 1949 Maps 
 8
 6
 4
 2-3-5-6-1
 8
 9