Troye's map of the Witwatersrandt gold fields. With the latest information / 
Troye, G. A.
Weller, Francis Sidney.
Johannesburg :  Mendelssohn & Scott ;  London :  J.C. Eley & Co., 
1890.
Inset: Geological Section from Pretoria through Johannesburg to Roodepoort south of Klip River, &c.
List of Companies owning mining property.