NGS Surveyor Posted August 6, 2009 Share Posted August 6, 2009 I'm trying to confirm the type of USC&GS disks that were used for tidal bench marks during the 1960s. Tidal bench marks were connected to tide gauges by differential leveling and are normally within 1.2 mile or so of a tide gauge. Does anyone have any photos, preferably with dates from the later part of the 1960s? Thanks, GeorgeL NGS Quote Link to comment
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