References

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Geiling, Natasha. “Beneath Paris’ City Streets, There’s an Empire of Death Waiting for Tourists.” Smithsonian Magazine. Smithsonian, 28 Mar. 2014. Web. 16 Nov. 2016
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Lyden, Jacki. “Life Below The City Of Light: Paris Underground.” NPR. NPR, 29 Jan. 2011. Web. 28 Nov. 2016.
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Shea, Niel. “Paris Catacombs.” Paris Catacombs – National Geographic Magazine. N.p., Feb. 2011. Web. 16 Nov. 2016.
“Test Pitting.” Archaeological Research Services. N.p., n.d. Web. 28 Nov. 2016.