Star Trek vs. Star Wars - Book mentions via Google NGRAM
1960
1965
1970
1975
1980
1985
1990
1995
2000
2005
Years
0.000000%
0.000020%
0.000040%
0.000060%
0.000080%
0.000100%
0.000120%
0.000140%
0.000160%
Star Trek
Star Wars
Star Trek vs. Star Wars mentions in books : 1960 - 2008