The 1952 edition includes...

• A Syntopicon: An Index to The Great Ideas Compiled by Mortimer Adler part I (Angel to Love).

...and is available to download from...

The Internet Archive from ia-mario, Universal Library

• Available formats ABBYY GZ, DAISY, EPUB, FULL TEXT, ITEM TILE, KINDLE, MILLION BOOKS ORIGINAL TIFF ZIP, PDF, SINGLE PAGE PROCESSED TIFF ZIP, TORRENT

The Internet Archive from Public Resource, Public Library of India (poor copy)

• Available formats ABBYY GZ, DAISY, EPUB, FULL TEXT, ITEM TILE, KINDLE, PDF, PDF WITH TEXT, SINGLE PAGE PROCESSED TIFF ZIP, TORRENT

...and is available to borrow from...

The Internet Archive from sf-loaders@archive.org, Internet Archive Books

• Available as ENCRYPTED DAISY, "Borrow this book to access EPUB and PDF files"

Notes about the Syntopicon

Wikipedia

• Adler was conflicted about the list of concepts in the Syntopicon and wrote a number of works that extended on it, most notably "Six Great Ideas: Truth–Goodness–Beauty–Liberty–Equality–Justice" (1981) and a single volume reprint of the commentary on all 102 ideas without indexing to the Great Books or cross-references to the other Great Ideas in "The Great Ideas: a Lexicon of Western Thought" (1992)

• Wikipedia makes an apt analogy regarding the list of the great ideas when it says, "People, particularly ideologues, would see the list of Great Ideas as representing a kind of popularity contest of significance among ideas when the Great Ideas were actually employed to group ideas under short-as-possible names more like older and newer constellations established over the centuries are used as a convenience to group stars in the night sky, which even the most modern astronomers might use to introduce the study of the stars to novices."