Help! Looking for resources 2ft Trench Engines *LINK*

Dearest Gentlepeople,
After looking long and hard for Colorado Narrow gauge in Germany I've had to admit it's a lost cause and am settling in on 24"to the 2ft gauge.
OK there was really only the Gilpin Ore Tram in Colorado but at least we have a Baldwin 50hp Benzin engine here at our muesem.
Next year we want to start restoration work. And we need much more information, especially about the "michigan" combustion engine if I've remember right.
Anybody ever run across information or website or archives that get into the technical information about the baldwin, alco and porter steam trench engines and alike. We'd love to have an American steamer in our collection, so far we only have the Baldwin gas engine. Any tips would be appreciated.
Naturally, I'm trying to build my library as well and the book listed below are out of print, anybody know any good sources besides Amazon?
"Two-Foot Rails to the Front" &
"Narrow Gauge to No Mans Land"
<[www.laurelltrains.se]>
Thor (colorado narrow gauger in exile)