Try your local technical faculty library first. The physical book is worth the effort. But for the digital nomads and late-night studiers—the search for the PDF continues.
If you want a digital copy legally:
Essential data for materials, resistance, and electrical components. Digital Accessibility (PDF) Dragutin Kaiser Elektrotehnicki Prirucnik Pdf
While editions vary, the standard structure includes: Try your local technical faculty library first
Why Dragutin Kaiser’s Elektrotehnički priručnik Remains a Bible for Engineers (And Where to Find It Legally) Dragutin Kaiser Elektrotehnicki Prirucnik Pdf