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Image: Clarke levelling of England 1860

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Original image(5,000 × 6,300 pixels, file size: 4.07 MB, MIME type: image/jpeg)

Description: principal lines of spirit levelling 1860
Title: Clarke levelling of England 1860
Credit: Own work
Author: Peter Mercator
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes

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