| File Name | Size | Date | |
 | Windmill_Windkraft_German_Book_1_1989.pdf | 38362 KB | 7/11/2006 |
| Windmill_Windkraft_German_Book_2a_1989.pdf | 70768 KB | 7/11/2006 |
| Windmill_Windkraft_German_Book_2b_1989.pdf | 67186 KB | 7/11/2006 |
| Windmill_Windkraft_German_Book_3_1989.pdf | 39676 KB | 7/11/2006 |
| Windmill_Windkraft_German_Book_4_1989.pdf | 15263 KB | 5/25/2006 |