![](http://www.alamy.com/thumbs/6/50684AC7-550F-49A1-977C-6DADD12CBBA5/2T3BFT2.jpg)
Progress chart of the Survey of the Northern & North Western Lakes, July 1st, 1873 : primary triangulation, telegraphic longitudes, shore line, topography and hydrography
Size: 7008px × 4398px
Photo credit: © piemags/DCM / Alamy / Afripics
License: Licensed
Model Released: No
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