Verlag: Assen, Van Gorcum & Comp. N.V. 1957, 1957
Anbieter: Antiquariaat Schot, Hendrik-Ido-Ambacht, Niederlande
Original publisher's sewn cream paperback, title spine and frontcover, large 8vo: 374pp., tables, graphs. figs., footnotes/bibliographical notes, summary in English, appendices, bibliography. Text in Afrikaans. Fine copy., Thesis University Groningen.