pl23_theb1156.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23theb1156jpgDescription
Duplex bar No. 15 on its trestles.Figure No. 5, Appendix No. 11.Part II, Report of the Superintendent ... 1897, p. 483.
Credit
NOAA Central Library
Display Date
1897
Collection
Historic Coast & Geodetic Survey
Keywords
Geodesy
Base Line
Instruments