Book Like The Urantia Book, But Longer

Long, long ago, while browsing through a library or something, I came across a book that was very much like The Urantia Book, but it was a different book. To my recollection, the book I found was even longer and stranger than Urantia.

But I do not remember the name of the book. I feel like it started with a ‘U’ but I am not sure.

Does anyone have any idea what book this might have been?

-FrL-

You would probably get a better response to this in Cafe Society. I have reported the thread for a mod to move.

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So moved, seconded, and passed.

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Could it have been this one?

“Oahspe”

Or Madame Blavatsky’s “Isis Unveiled” :

Or Blavatsky’s “The Secret Doctrine” :