MARC records (Machine Readable Cataloging records) are bibliographic information about books and journals (e.g., Publication Title, Author Name, Publisher, etc.) that is in a special format that is used by libraries' Online Public Access Catalog (OPAC) system. An OPAC serves as a digital card catalogue and MARC records serve as the individual cards.

ASTM offers free access to MARC records for all of its E-books, Journals, and at the individual paper and chapter level for all e-books and journals.