The Nippon Decimal Classification (NDC, also called the Nippon Decimal System) is a system of library classification developed for mainly Japanese-language books maintained and revised by the Japan Library Association since 1948.
Originally developed in 1929 by Kiyoshi Mori, the 10th and latest edition of this system was published in 2014.
The decimal notation system is similar to the Dewey Decimal System, and the order of main classes is inspired from the Cutter Expansive Classification.
The sub-categories of the History category are: The Social Sciences category contains books that contain information regarding modern day society, such as government systems and cultural traditions.
The sub-categories of the Technology & Engineering category are: The Industry and Commerce category contains books that contain information regarding business, products, transportation systems, and money.