Yellowstone National Park was established as the world's first truly national
park. It look like this inspired book writers immediately and there's been fairly
steady growth up until 2000 (There was a bit of a dip for the Second World
War) After 2000 there's a bit of a decline - and that's true of several Ngrams
I've tried. I'm on the lookout for an explanation�.
http://books.google.com/ngrams/graph?content=National+Park&year_start=1850&year_end=2008&corpus=15&smoothing=0&share=
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