USGS Legacy Benchmark Descriptions
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资源简介：
The benchmark descriptions are grouped by United States Geological Survey (USGS) 15-minute quadrangles. Datums: North American Datum of 1927, National Geodetic Vertical Datum of 1929, Sea Level Datum of 1929. The documents were scanned to preserve the historic horizontal and vertical survey control data from USGS. Datasheets: https://kygeonet.ky.gov/ngs/usgs_datasheets/
创建时间：
2025-04-04
