| File Name | Size | Date | |
 | Electric_Furnice_Patent_1899.pdf | 1625 KB | 6/17/2005 |
| Heating_And_Cooking_With_Wood_Ken_Kern_1974.pdf | 1230 KB | 2/6/2004 |
| Heat_And_Cool_Inexpensively_With_A_Ground_Source_Heat_Pump_2001.pdf | 27 KB | 11/8/2001 |
| The_Complete_Book_Of_Heating_With_Wood_1974.pdf | 9125 KB | 10/21/1999 |
| The_Heat_Generator_Mechanical_Power_Directly_Into_Heat_1983.pdf | 8699 KB | 10/21/1999 |