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Word: petrography (lookup in dictionary) (lookup stats)
Dates: during 1880-1889
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Word Time Machine

Normalized population density for word "petrography" throughout decades:

1880s : 1.1506
1890s : 3.9968
1900s : 8.4435
1910s : 7.6691
1920s : 0.4744
1930s : 0.2516
1940s : 0.1729
1950s : 0.0864
1960s : 0.0267