List of sources:
Cape of Good Hope. Report of the Surveyor-General, 1893.
FamilySearch: William Maxwell Edwards. https://www.familysearch.org/search/record/results?q.anyDate.from=1874&q.givenName=William Maxwell&q.surname=Edwards
Google scholar. http://scholar.google.co.za/ Publications by WM Edwards.
Journal of the Institute of Land Surveyors of the Transvaal, 1905, Vol. 1(1), pp. 24-27 and 1909, Vol. 1(8), pp. 338-341: Lists of members.
Liebenberg, E.C. Die topografiese kartering van Suid-Afrika, 1879-1972; 'n histories-geografiese ontleding. MA-verhandeling in Geografie, Universiteit van Suid-Afrika, 1973.
National Archives Repository (TAB), Source MHG, Vol. 0, Ref. 8664/59: Death notice, last will and testament, William Maxwell Edwards.
National Automated Archival Information Retrieval System (NAAIRS), at http://www.national.archives.gov.za/naairs.htm Documents relating to William Maxwell Edwards / W. Maxwell Edwards / Mr Maxwell Edwards / W.M. Edwards.
South African Survey Journal, June 1934, Vol. 4(6), p. 211: Notes and comments.
South African who's who, 1908.
Transvaal Civil Service List, 1906.
Union of South Africa. Public Service List, 1914. Pretoria: Government Printer, 1914.
University of the Cape of Good Hope. Calendar, 1893/4.