There is access to more information and other work by the photographers included in this digital collection through the website of the Dutch Photography Museum.
www.nederlandsfotomuseum.nl

DeMijnen.nl (also provides access to the DSM archives).
www.demijnen.nl

Regional Historic Centre Limburg
www.rhcl.nl

Dutch Mining Museum
www.nederlandsmijnmuseum.eu

Limburg Museum
www.limburgsmuseum.nl

Werner Mantz
http://wernermantz.wordpress.com