The search term typically points to the high demand for digital scans of the older, more rigorous editions. Many students prefer the older versions (often circulated as PDFs on student forums and educational repositories) because modern print editions sometimes abridge the content or change the numbering of the famous problems.
In a world of colorful, simplified modern textbooks, why do people still hunt for a scan of a book written decades ago? Unrivaled Depth:
Costin D. Nenițescu (1902–1970) is widely regarded as the founder of the modern Romanian school of organic chemistry. A professor at the Politehnica University of Bucharest and a member of the Romanian Academy, Nenițescu authored textbooks that have educated generations of chemists, engineers, and medical professionals. Understanding "Chimie Generală"
Given that the physical copies of the book are often decades old, found only in dusty library stacks or passed down from older siblings, the digital version has become a hot commodity.