Zhōngguó
Pусский
English
Français
Español
About Tunnelling
Why
go underground
How
to go underground
Use
of underground spaces
Case
Histories
Main glossary
Public domain
Search for glossary terms (regular expression allowed)
Begin with
Contains
Exact term
Sounds like
All
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
Term
Definition
Public domain
An area of information, knowledge or physical space that is considered owned by the public and accessible by all