The secular variation programme of the Hermanus Magnetic Observatory
Subtitle: progress report, 1953.
By: Results of observation at the secular variation field stations in South Africa, 1952-53.
Publisher: Govt. Printer
Published: 1950
Place of publication: Pretoria
Language: eng
Number of pages: 34
Subjects: Geomagnetism -- Secular variations -- South Africa.
Other titles: Results of observation at the secular variation field stations in South Africa, 1952-53.
Notes: At head of title: Union of South Africa, Department of Lands, Trigonometrical Survey Office.