Book for cryptograph i nstruction by the Irgun underground. The book is comprised of bound copy paper and was secretly distributed between members of the Irgun. The Irgun used encrypted media extensively, and taught its members how to transmit secret information with this booklet.
[2] 57 [1] leaves, 27.5 cm. Stencil print on copy paper, with many supplements in blue pen by the student who used it. Brown cardboard binding.
Very fine condition.