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Reference Mark

National Geodetic Survey Reference Mark Disk. This style of disk was used after NGS was formed in 1970 from the U.S. Coast & Geodetic Survey.

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Uploaded on January 9, 2008
Taken on February 25, 2003

Reference Mark

National Geodetic Survey Reference Mark Disk. This style of disk was used after NGS was formed in 1970 from the U.S. Coast & Geodetic Survey.

962 views
0 faves
0 comments
Uploaded on January 9, 2008
Taken on February 25, 2003
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