An example query


            {
            "method": "return_tsv",
            "counttype":["WordsPerMillion"],
            "search_limits": {
	    "country": ["USA","UK"],
            "word": ["natural selection"]
            },
            "groups": [
            "year"
            ],
            "database": "OL"
            }

The Response


            year    WordsPerMillion
            [...]
            1907    340.20526777
            1908    341.83114533
            1909    295.24911692
            1910    282.24802327
            1911    284.92406591
            1912    283.89805752
            1913    296.87614627
            1914    332.76147647
            1915    446.39889626
            1916    428.87396542
            1917    527.51044740
            1918    647.48528263
            1919    653.05159042
            1920    507.23177682
            1921    501.77615474
            [...]

The Response


            year    WordsPerMillion
            [...]
            1907    340.20526777
            1908    341.83114533
            1909    295.24911692
            1910    282.24802327
            1911    284.92406591
            1912    283.89805752
            1913    296.87614627
            1914    332.76147647
            1915    446.39889626
            1916    428.87396542
            1917    527.51044740
            1918    647.48528263
            1919    653.05159042
            1920    507.23177682
            1921    501.77615474
            [...]

Bookworm ChronAm

4 million newspaper pages, 1840-1922

From chroniclingamerica.loc.gov

Location, Subject, and Ethnic metadata

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