@techreport{a2015hydrological, title = {Hydrological Heritage Overview: Johannesburg: Gold in the Rand, Water from the Land} author = {A publication of the Water Research Commission of South Africa Matthys A. Dippenaar (with photographic contribution by Gerrit Burger)}, url = {http://www.wrc.org.za/wp-content/uploads/mdocs/Hydrological%20Heritage%20Overview_Final_Web.pdf}, year = {2015} }