The Grampian Speleological Group

http://www.sat.dundee.ac.uk/arb/gsg/

The National Library of Scotland

http://www.nls.uk/maps/index.html

EdinPhoto

http://www.edinphoto.org.uk/index.htm

aditnow.co.uk

http://www.aditnow.co.uk/default.aspx

DerelictPlaces

http://www.derelictplaces.co.uk/

Darkplaces.co.uk

http://www.darkplaces.co.uk/phpBB2/portal.php

Subterranea Britannica

http://www.subbrit.org.uk/

List of Collieries at work in 1854

http://www.jnadin1.50megs.com/custom4.html

flashearth.com

http://www.flashearth.com/