2017-03-12
These advertisements for Don Herold’s book “How to Choose a Slide Rule” both appeared in the October 1st, 1940 edition of the Idaho Argonaut.
From the Argonaut Digital Collection.
These advertisements for Don Herold’s book “How to Choose a Slide Rule” both appeared in the October 1st, 1940 edition of the Idaho Argonaut.
From the Argonaut Digital Collection.