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A two-dimensional grid containing elevations which defines the boundary between rock and air.
출처: www.rkmassoc.com/mmdocs/v1-sec07.htm
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| surface |
36,420 sq.mi Population: 6,080,485 Located in: North America Area Code: 219, 260, 317, 574, 765, 812 President/Governor: Joe Kernan Flag/Coat of Arms:
출처: www.maximumedge.com/encyclopedia/Regional/North_Am...
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