The blurb from Internet Archive
This is an advertising booklet published in the USA by the Bauer Type
Foundry (Germany) in 1937. It argues that Bauer type, while
machine-made, retains that "human touch." It is notable for three
features, however. First, it was printed by Joseph Blumenthal's Spiral
Press, one of the great commercial fine arts presses of the 20th
century. It is therefore piece of fine printing uncommon in the
advertising world. Second, it acknowledges as valid and important the
method of making typefounding matrices by engraving a patrix and then
electroforming a matrix from it. This method, while of great importance
in 19th and 20th century typefounding, is often ignored or disparaged.
Third, it reprints three illustrations by Karl Mahr depicting aspects of
the type-making process. These appeared originally in Mahr's "Der
Druckbuchstabe" (1928).
The Book is HERE.