Set of 12 Pamplets Industrial Electronics Twelve staplebound pamplets published by General Electric Company in 1950.
Each pamplet on a different facet of the subject contains photos diagrams and self-check quiz. Title are:
Harnessing The Electron
Electronic Tubes As Rectifiers
Grid Control of Electronic Tubes
Fundamentals of Electricity Part I
Fundamentals of Electricity Part II
Electronic Relay Systems
Electronic Rectifier Equipment
THY-MO-TROL
Electronic Control of A-C Power
Electronic Frequency Changing
Photoelectric Relay Systems
Electronics Today and Tomorrow

Surprisingly bright clean and still tightly bound collection.