Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1900 - 1918 1919 - 1943 1944 1945 - 1947 1948 - 1950 pittsburgh English
1900 - 1903 1904 - 1925 1926 - 1929 1930 - 1942 1943 - 1950 pittsburg English

Run your own experiment! Raw data is available for download here.
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