... Exemples de rayons auroraux dépassant des altitudes de 500 kilomet̀res au-dessus de la terre.
Series: Geofysiske publikationer; vol. II no. 2
Publisher: I kommission hos Cammermeyers boghandel
Published: 1921
Place of publication: Kristiania
Language: fre
Subjects: Auroras.
Notes: Bibliographical foot-notes.
Cover-title.