Chicago: Eugene Dietzgen Co., 1941.
Staplebound wraps. 8 3/4" X 5 3/4". 18pp. Moderate weary to yellow printed staplebound paper wraps, with center crease to pamphlet, creasing to wraps, edgewear, soiling and small tears at head and tail of spine. Pencilled equation to rear wrap. Binding is sound. Pages are creased with occasional pencilled notation or spot of soiling. A worn but still quite charming 1941 guide to using a Dietzgen slide rule. Good. Item #3300