Levantamentos magnéticos, período 1910-1931
By: Ministério da Educação e Cultura, Observatório Nacional.
Series: Publicações do Serviço Magnético ;; no. 8
Publisher: O Observatório
Published: 1960
Place of publication: Rio de Janeiro
Language: por
Number of pages: 55
Subjects: Geomagnetism -- Secular variations -- Brazil.