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UN number

U
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
0
1
2
3
4
5
6
7
8
9
Are four digit numbers assigned by the United Nations Committee of Experts on the Transport of Dangerous Goods that identify hazardous substances. For example: UN1066 is recognized throughout the world as identifying nitrogen.


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