A "better" PDF is one that has undergone OCR (Optical Character Recognition) . Because the book is filled with complex Greek sub-scripts and mathematical notations, a standard scan is often unsearchable. Look for versions that allow you to "Find" specific terms like "Boltzmann equation" or "Enskog theory."
Use Hirschfelder to understand the theory of why a specific potential model is chosen, then use modern Python libraries or molecular dynamics suites to perform the actual calculations. Conclusion
Because the book is encyclopedic, it can be intimidating. To get the most out of it: