Because the book is impossible to find cheaply, a generation of geologists in developing nations (Africa, South America, Asia) turned to scanned PDFs. These scans (usually hand-done by students in the 1990s) are often of low quality—crooked pages, missing plates, illegible fold-out charts.
The PDF version of "Introduction to Exploration Geochemistry" by Levinson is widely available online, making it accessible to a new generation of geoscientists and researchers. introduction to exploration geochemistry levinson pdf
The book explains how elements move away from their source deposit through physical, chemical, or biological processes, creating a "target" much larger than the actual ore body. Because the book is impossible to find cheaply,