How HNDBK E-book "Roarks" can be read or converted as HDBK E_BOOK "ROARKS" into MATHCAD PRIME3.0?
If you look, each handbook has a folder with many worksheets in it. You can convert each sheet to Prime; how you replicate the linked contents file is a good question.
Please find my answer about "E-books conversion scripts for PTC Mathcad Prime 3.1" here:
Re: MathCAD Prime 3.0 & Roark Toolkit, possible?
https://support.ptc.com/appserver/cs/view/solution.jsp?n=CS200084
According with "Mathcad Prime 4.0 What's New" guide, quote: "the 6-th Edition of the Roark's Worksheet Library is now available for purchase for Mathcad Prime 4.0. Provides a library of templates of stress and strain calculations on a comprehensive collection of structural components".