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f: 
SMfel-,, 
fij 
fejNBr 
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a 
if 
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ip* 
H 
es. The spurs ^ 
I The hill at th 
;teep scarp, from 
i Inclined tableh 
V 
P II 
// 
On the maU 
"1 
w 
a 
// 
// 
ly beneath its **** 
^yne li; 
t vertical distance 
itated at the bottc 
jg to the topogra 
may be as smal 
•j as great as 25C 
° *1 ' 
more easily certekk 
| heavier than tfb 
lg altitude. The 
<; 
tions, summits, s 
ten on the map 
foot only# Mo 
s are given in thc^ 
ling. 
erse stations are a 
‘ 44/9 
0 
IS 
3S 
~^y 
/ ,/ is 
>/ 
w 
CTfS; 
The geode 
'K 
man are shown in 
te, county, city, 1 
i by continuous c 
I Public roads si 
1 
e year are shown 
\ 
\ 
\ 
\ 
St 
25°' 
\ 
\ 
\ 
\ 
k 
\ 
\ 
A 
\ 
K ft 
;w 
\ 
* 
w 
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<4 16Q 
'l 
g 
‘ 
A survey of* Puerto Rico 
the published maps is 
The features shown on top 
— (1) water, in< 
and other bodies 
three groups 
swamps, 
mountains, hills, valleys, and 
(3) culture (works of man),| 
roads, and boundaries. Thj 
features are shown and expla 
some earlier maps, and addi 
some special maps. 
All the water features ar< 
streams and canals by single 
by double lines. The lara 
accentuated by blue water ) 
streams — those whose beds ar 
are shown by lines of blue d< 
Relief is shown by contoi 
maps are supplemented by i 
• . 
thrown from the northwest f < 
purpose of giving the appea 
the interpretation of the con 
sents an imaginary line on j 
of which is at the same altii 
could be drawn at any altitj 
tours at certain regular inte 
• 
datum or zero of altitude ot t 
a sea level. The 20-foot cont 
