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TITLE
 
DATE
 
MAP #
 
SCALE
 
TOPOGRAPHER
Forts Chaplin, Mahan, Sedgwick, and Battery Craven  
1865
1036
1:10,000
  C.M. Bache
Potomac River, from Georgetown to foot of Little Falls (northern half)  
1872
1340a
1:2,500
  C. Junkin
Potomac River, from Georgetown to foot of Little Falls (southern half)  
1872
1340b
1:2,500
  C. Junkin
New Naval Observatory site  
1881
1488
1:1,200
  John Rodgers, USN
Potomac River, from Jones' Point to Little Falls Bridge  
1863
910a
1:15,000
  C.H. Boyd
U.S. Naval magazine near Marbury Point  
1874
910b
1:1,200
  J. Hergesheimer