Good to acceptable condition

Staples are not rusted

NOTE The front and back covers came off of the one titled "How Transistors Work".

Very readable and usable

I think they were stored in an air conditioned place because they do not smell dirty and old.

Lot of 8 vintage National Radio Institute booklets

Covering topics such as vacuum tubes, low frequency voltage, AC DC generators and motors, transistors, polyphase generators, schematic diagrams, radio formulas

Staple-bound

Published in the 1950s