The RSC website is the 'go to' site for anyone interested in or collecting British Central Africa; and the Rhodesia's or Nyasaland. The society holds regular meetings in the UK and South Africa.
The Rhodesian Study Circle
The Philatelic Federation of South Africa
A website for those with an interest in the philately of the Transvaal. Although quite limited, it's the best online resource for those with an interest in this historically important province of old South Africa.
Although Siegel's are a USA auction house, their research page is a great source of global philatelic information. Free downloads include auction catalogues back to 1931; and censuses of the world's rare stamps.
The USPCS website is a phenomenal resource for anyone interested in classic stamps of the United States. A lot of the information is available in both digital form and as a pdf download.
Address: The Athenaeum, 154 Campground Road, Newlands
Founded as the Cape Town Philatelic and Exchange Club on 3rd May, 1911; we became the Royal in August, 1953.
The Transvaal Study Circle
The Federation's website serves as an essential resource for collectors of Southern African stamps. It features extensive lists of clubs, dealers, and events; and updates collectors on matters relating to new issues, etc.
The RPSL is the world's oldest philatelic society. It's website includes an exhaustive overview of everything that the RPSL has to offer - the museum, the library, great collections, etc.
The website of the FIP Postal History Commission is the go to website for postal history collectors who are interested in exhibiting competitively. It includes very useful guidance as to judging criteria.