TOPOGRAPHIC    MAPS    AND     FOLIOS    OF    THE     UNITED 
STATES. 
TOPOGRAPHIC  ATLAS  SHEETS. 
When,  in  1882,  the  Geological  Survey  was  directed  by  law  to  make  a  geologic-  map 
of  the  United  States,  there  was  in  existence  no  suitable  topographic  map  to  serve  as 
a  base  for  the  geologic  map.  The  preparation  of  such  a  topographic  map  was  there- 
fore immediately  begun.  About  three-tenths  of  the  area  of  the  country,  excluding 
Alaska,  has  now  been  thus  mapped.  The  map  is  published  in  atlas  sheets,  each 
sheet  representing  a  small  quadrangular  district,  as  explained  under  the  preceding 
heading.  The  separate  sheets  are  sold  at  5  cents  each  when  fewer  than  100  copies 
are  purchase  1,  but  when  they  are  ordered  in  lots  of  100  or  more  copies,  whether  of 
the  same  sheet  or  of  different  sheets,  the  price  is  2  cents  each.  The  mapped  areas 
are  widely  scattered,  nearly  every  State  being  represented.  About  1,100  sheets  have 
been  engraved  and  printed;  they  are  tabulated  below. 
Published  topographie  atlas  sheets,  arranged  by  States,  (a) 
ALAR  AM  \. 
Name  of  atlas  sheet. 
Anniston 
Ashland 
Bessemer 
Birmingham k 
Brookwood 
Clanton  
Cullman 
Fort  Payne  (Ala-Ga.) 
Gadsden 
Huntsville  (Ala.-Tenn.)  .... 
Jasper  
Rome  (Ga.-Ala. ) 
Scottsboro  (Ala.-Tenn. ) 
Springville 
Stevenson  (Ala.-Ga.-Tenn.). 
Talladega 
Tallapoosa  (Ga.-Ala.) 
Position  of  SE. 
corner  of  sheet. 
33  30 
33  00 
33  00 
33  30 
33  00 
32  30 
34  00 
34  00 
:;i  (in 
34  30 
33 
30 
34 
00 
34 
30 
33 
30 
34 
30 
33 
00 
33 
30 
Long. 
Area  covered 
85  30 
85  30 
86  30 
86  30 
87  00 
86  30 
86  30 
85  30 
86  00 
86  30 
87  00  ' do 
do 
do 
do 
85  00 
86  00 
86  00 
85  30 
^6  00 
85  00 
j degree 
....do.. 
....do.. 
....do.. 
....do.. 
....do.. 
....do.. 
....do.. 
....do.. 
....do... 
Contour 
interval. 
Feet. 
50 
100 
100 
100 
50 
50 
100 
50 
100 
100 
50 
100 
100 
100 
100 
100 
100 
Scale. 
1 :  125000 
1  : 125000 
1 : 125000 
1  : 125000 
1  : 125000 
1  :  125000 
1  :  125000 
1  : 125000 
1 :  125000 
1 : 125000 
1 :  125000 
1 :  125000 
1  :  125000 
1 :  125000 
1 :  125000 
1 :  125000 
1 :  125000 
Price. 
( '<  nts. 
5 
5 
5 
5 
5 
5 
5 
5 
5 
5 
5 
5 
5 
5 
5 
5 
5 
a  The  Survey  has  issued  a  sheet  of  "Conventional  signs"  used  on  its  topographic  maps;  price,  5 
cents  a  single  sheet;  2  cents  each  in  lots  of  100  or  more. 
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