Google Books Ngram Viewer

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

1700 - 1784 1785 - 1872 1873 - 1881 1882 - 1891 1892 - 1900 coal English
1700 - 1770 1771 - 1867 1868 - 1877 1878 - 1888 1889 - 1900 iron English
1700 - 1812 1813 - 1880 1881 - 1887 1888 - 1893 1894 - 1900 steel English
1700 - 1821 1822 - 1870 1871 - 1878 1879 - 1893 1894 - 1900 steam English

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