Britannica Encyclopaedia 15th Edition New Sealed 30 books missing 26 & A-M Out of Print

15th Edition:

This edition, first published in 1974, was a major overhaul of the encyclopedia. It was designed with a three-part structure to improve user experience: 

• Micropædia: A ready-reference and index section. 

• Macropædia: Articles offering in-depth knowledge. 

• Propædia: A guide to the outline of knowledge. 

End of Print Editions:

Encyclopædia Britannica, Inc. discontinued printing the encyclopedia in 2012, with the 2010 edition being the last printed version. 

Digital Focus:

Since then, the encyclopedia has been exclusively published online at Britannica.com. 

Legacy:

The 15th edition, also known as "Britannica 3," represents a significant effort to modernize the encyclopedia and adapt to changing information consumption habits.