Catalog data are a library’s most important map to knowledge. What does it mean that the Library of Congress just released 25 million records to the public?

They've just used a game called Within Range to ... teach the Dewey Decimal System. [Update: It's the Library of Congress classification system.

Object Details Author Library of Congress Subject Cataloging Division Notes "The additions and changes in Class Q, adopted while this work was in press will be cumulated and printed in List 234 of LC ...