30-60 Rumely E Tractor – International M Engine – GAS ENGINE Magazine

Gas Engine Magazine. – Rare & Special – 1 ½ HP International M Engine (1 pg). – Standard Twin Information (1 pg).

Wolverine Motor Works, 20 HP Fuller & Johnson, Wisconsin Gas Engine Companies

Wolverine Motor Works Catalog: Circa 1900 (2 pages). The Gas Engine Magazine. – Oil Field Engine News – Hog-Trough Engines (1 page).