What is an alphabetically arranged list of books and materials that are part a library called what?

An alphabetically arranged list of books and materials that are part of a library is called a catalog.

There are different types of catalogs, such as:

* Card catalog: A traditional catalog where each book has a separate card with its information.

* Online catalog: An electronic catalog that allows searching for books and other materials using a computer or mobile device.

* Subject catalog: A catalog that lists books by subject.

* Author catalog: A catalog that lists books by author.

* Title catalog: A catalog that lists books by title.

All of these catalogs ultimately serve the same purpose: to help library users find the resources they need.