﻿Plate 
  VI. 
  

  

  Computed 
  

   s°*-elevalior)s 
  

  

  - 
  2 
  so*-Grode 
  in 
  lomls. 
  

  

  ler 
  or 
  differences 
  

  

  6000 
  

  

  •2000 
  

  

  •1000 
  

  

  -1000 
  

  

  Piedmont 
  Terraces 
  

   Maryland 
  

  

  40ro55 
  miles 
  from 
  plone 
  of 
  projection 
  

   20 
  ro 
  40 
  miles 
  

   to 
  20 
  miles 
  

  

  o 
  Miles 
  

  

  423 
  

  

  , 
  the 
  

   then 
  

   ater, 
  

   !S 
  of 
  

  

  the 
  

   por- 
  

   fea- 
  

   eing 
  

   r 
  eral 
  

   Oon- 
  

   four 
  

  

  the 
  

   und- 
  

   rine 
  

   tern 
  

  

  the 
  

   s 
  an 
  

   ssor 
  

  

  need 
  

   , 
  the 
  

   j 
  re- 
  

   may 
  

   e 
  of 
  

   lain, 
  

   sur- 
  

   con- 
  

   Bar- 
  

   ^inal 
  

   enn- 
  

   Dyed 
  

  

  aces 
  

   n 
  in 
  

   to 
  a 
  

   the 
  

   d 
  to 
  

   e 
  of 
  

   part 
  

   then 
  

   able 
  

   iphy 
  

   in 
  a 
  

   gion 
  

  

  