REFERENCE. 



O Class A,B',&.B 2 



D C 



" D&E 



a 



for description of classes see p 348. 

 *_ SCALE OF MILES 





." ' J 



/>fe^/7t,< ft'Wffi? V^' .' 

 - 



EARTHWORKS. 



[Tojace page 345. 



