Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

1. Blechspielzeug Dampfspielzeug, by Wolf Kaiser and Carlernst J. Baecker

Translation: Tin Toy Steam Toy

2. Schiffman Sammlerkatalog, by Schifmann-Verlag

Band (Volume) 21; Dampfmaschinen mit stehendem Kessel (Vertical Steam Engines)

Band (Volume) 23; Lokomobilen Dampffahrzeuge HeiBluftmotoren (Locomobiles; Steam Vehicles; and Hot Air Engines)

Band (Volume) 22; Dampfmaschinen mit ligeendem Kessel (Steam engines with a horizontal boiler)

3. The Toy Engine Collector, a Quarterly Newsletter for Steam, Hot Air and Electric Motor Toy Enthusiasts
Published from 1985 to January 2001 (24 Issues).

I have a complete set.  If you would like a copy, I can see how much it would cost to have it copied and bound.

4. Metalware Corporation, Empire Educational Toys (Steam Engines) by Donald Stilson

I believe that reprints can be purchased from Don's son.
 
5. Weeden, The Company and its Products by Kenneth Trobaugh

Information on purchasing a digital copy are available on the weedensteam.com website in its parts store.