Alibrary's online catalog is a computerized index for?

Books found within the Library.

Explanation:

A library's catalog is a register of all the material that is found in a library. This includes books, as well as other bibliographic material such as computer files, maps, magazines, etc. While catalogs were traditionally made up of physical cards, most of them are now presented in an online format. This is known as the online public access catalog (OPAC).

he agrees with the monk's positions.

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