![]() | Technology and Resource Use in Medieval Europe : Cathedrals, Mills and Mines Elizabeth Bradford Smith, Penn State University and Michael Wolfe, Penn State University. |
![hidden image for function call](https://upload.wikimedia.org/wikipedia/commons/c/ca/1x1.png)
![]() | Technology and Resource Use in Medieval Europe : Cathedrals, Mills and Mines Elizabeth Bradford Smith, Penn State University and Michael Wolfe, Penn State University. |