If all else fails, these modern textbooks cover the same principles and are easier to find as legal PDFs (including free instructor samples):
Note: The book is still under copyright. Below is a concise overview of its content, why it remains a staple in chemical‑engineering curricula, and legitimate ways to obtain it. No links to unauthorized copies are provided. principles of unit operations foust pdf free download
Each chapter contains solved examples using both SI and English units. The end-of-chapter problems are renowned for their difficulty and realism—many have been reproduced in licensing exams (FE/PE) for decades. If all else fails, these modern textbooks cover