Coal Mining in the Netherlands
- http://www.ta.tudelft.nl/coalpage/
- Provides a detailed historic overview of the former coal mines that dominated the South Limburg area in the Netherlands from the beginning of the 20th century to the midst of the 1970's .
Iron Range Region
- http://nrhp.mnhs.org/iron_range.html
- History of Minnesota's iron ranges, the Vermilion, Mesabi and Cuyuna. Includes mining, processing, and transportation. From the Minnesota Historical Society.
The Sandhog Project
- http://www.sandhogproject.com/
- Interactive online exhibition designed to introduce the surface-dwellers of the city to the vibrant characters and systems of the Manhattan underground. Includes audio and video.