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Sources:
https://www.nist.gov/sites/default/files/documents/pml/div683/museum-timeline.pdf
http://www.surveyhistory.org/the_standard_meter1.htm
http://physics.nist.gov/cuu/Units/meter.html
http://www.npl.co.uk/educate-explore/factsheets/history-of-length-measurement/
https://www.nist.gov/sites/default/files/documents/pml/div684/fcdc/sp330-2.pdf
http://www.us-metric.org/origin-of-the-metric-system/
https://nature.berkeley.edu/classes/eps2/wisc/pt.html
Image Sources:
https://commons.wikimedia.org/wiki/File:Kilometre_definition.svg
https://commons.wikimedia.org/wiki/File:Platinum-Iridium_meter_bar.jpg