Google - Books Ngram view of Martial arts

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[sorokod]

I find the Ngram Viewer fascinating. Here is an example (http://ngrams.googlelabs.com/graph?content=Aikido%2CKarate%2CJudo%2CJujutsu%2CKendo&year_start=1800&year_end=2008&corpus=0&smoothing=3). Some details on how this works are here (http://ngrams.googlelabs.com/info).

[sorokod]

One of the cool things one can do is actually look at the relevant texts. This is how I found the scanned copies of "Black Belt" magazine from 60s and 70s with interviews like these:

http://books.google.com/books?id=AtoDAAAAMBAJ&pg=PA44&dq=%22Koichi+Tohei%22&hl=en&ei=lnOUTfe2KoGy8gOc7-UX&sa=X&oi=book_result&ct=result&resnum=1&ved=0CDwQ6AEwAA#v=onepage&q=%22Koichi%20Tohei%22&f=false

http://books.google.com/books?id=rdQDAAAAMBAJ&pg=PA62&dq=%22Ueshiba%22&hl=en&ei=vGWUTY7dJpHa4gbdh5nIDA&sa=X&oi=book_result&ct=result&resnum=2&ved=0CEAQ6AEwAQ#v=onepage&q=%22Ueshiba%22&f=false