The NLS produces and provides access to audiobooks for people who cannot read standard print. Many NLS copies of audiobooks are recorded by different narrators from those in the Audible or retail audiobook edition, which makes for an opportunity to add them as book editions to catalog the differing narrators.

Based on these sample entry from the NLS Catalog, these titles have NLS Book Numbers as well as LCCN numbers assigned which differentiate them from other editions, while also sometimes including the ISBN from the original text copy from which the recording was read.

The Martian by Andy Weir
Narrated by J.P. Linton
Public Facing Record:
https://lccn.loc.gov/2014991015
Gated Link for Verified Users:
http://hdl.loc.gov/loc.nls/db.78389
NLS Book Number: DB 78389
LCCN: 2014991015

TimeRiders by Alex Scarrow
Narrated by Dave Corey
Public Facing Record:
https://lccn.loc.gov/2011990544
Gated Link for Verified Users:
http://hdl.loc.gov/loc.nls/db.72804
NLS Book Number: DB 72804
LCCN: 2011990544