serious_books (mediatype)

literal strings: serious books

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• serious_books is a kind of media     

categories

• mediatype(97.8%)
• CPL @1096 (97.8%) on 18-jan-2018 [ "It has published many _" "_ have been written on" "author of many _" "_ published each year" "_ are being written about" "he published several _" "_ have been written about" "_ ever written on" "author of several _" ] using serious_books