7 specimens, the 1920s
Das Giessinstrument
1922 · Friedrich Bauer
1923 American Type Founders Specimen Book & Catalogue
1923 ·
Typewriter Topics October 1923 Historical Number
1923 · digital reprint by www.CircuitousRoot.com
Monotype: A Journal of Composing Room Efficiency, Whole No. 70 (May 1924)
1924 · Lanston Monotype Machine Company
Adjustments of the Type-&-Rule Caster
1926 · Lanston Monotype Machine Company
The Ludlow System of Slugline Composition
1927 · Douglas McMurtrie
Modern Type Display
1929 · J. L. Frazier