| Description | 1. PM Sanders, ‘Internal-Combustion Steam Engine Here! An investigation of the Erren Oxy-Hydrogen Motor and the Pressure Electrolyser as its source of fuel’, Motor Transport, 1 October 1932 [first page]
2. PM Sanders, ‘Operating the Oxy-Hydrogen Motor: how the Erren Engine Works’, Motor Transport, 8 October 1932 [first page]
3. Second or subsequent page of an article from Motor Transport – possibly but not certainly a continuation of one of the above.
4. Second or subsequent page of an article from Motor Transport – possibly but not certainly a continuation of one of the above
5. Second or subsequent page of a printed article, source not indicated
6. Typescript: Report on the Erren Hydrogen Engine (on headed paper of Tube Investments Ltd.: research department). First page. Not dated, author not stated.
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