Tried to access Prime 3.0 E-book in 3.1 but internal links appear to be broken

I tried to access an E-book, specifically calculations and table data in:

"About Electrical Power Systems Engineering

The documents in this book carry out common design calculations from electrical power systems engineering..."

The links in this E-book -- from the TOC, Index, and all pages in general -- do not work. 

I searched Help using "book", "e-book", and "E-books", but found no similar issue discussed.  Is there a special technique or setting required to use these older E-books with Prime 3.1? 

Also, if there are any other "keyword(s)" I should try - I would appreciate the feedback.  Thanks in advance!

Best regards,

Michael O.