The authors investigated to what extent the number of books published in half a year the libraries in Japan contain, and what category of the books they prefer. The libraries considered include public libraries, college or university libraries, and the national diet library. Their stocks were researched by means of the search APIs of Calil, Webcat Plus, Porta. The findings are as follows; The contents of the public libraries covered more than 80% of the books. On the other hand, the college or university libraries have less than 60%. They prefered the specialized books. The national diet library covered less than 90% of the books.
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