Google Books Ngram Viewer

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

1900 - 1944 1945 - 1990 1991 - 1994 1995 - 1998 1999 - 2000 horas extra Spanish
1900 - 1944 1945 - 1985 1986 - 1990 1991 - 1996 1997 - 2000 horas extras Spanish
1900 - 1915 1916 - 1933 1934 - 1941 1942 - 1992 1993 - 2000 gastos extra Spanish
1900 - 1925 1926 - 1982 1983 - 1988 1989 - 1994 1995 - 2000 gastos extras Spanish

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