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| Boy's Book of Engine Building How to Steam Hot Air | $ 12.95 |
| Boy's Book of Engine Building How to Steam Hot Air | $ 12.95 |
| Solar Engine hot air ? Steam engine toy PM Research NY | $ 17.26 |
| Solar Engine hot air ? Steam engine toy PM Research NY | $ 51.00 |
| Stirling Solar Engine hot air ? steam engine toy phx az | $ 51.00 |
| TESLA TURBINE ENGINE PLANS runs on air or steam! | $ 4.99 |
| Boy's Book of Engine Building How to Steam Hot Air | $ 12.95 |
| Boy's Book of Engine Building How to Steam Hot Air | $ 12.95 |
| 5 Cylinder Radial Steam-Air Engine | $ 377.00 |
| Boy's Book of Engine Building How to Steam Hot Air | $ 12.95 |
| Boy's Book of Engine Building How to Steam Hot Air | $ 12.95 |
| Boy's Book of Engine Building How to Steam Hot Air | $ 12.95 |