On the division of earth's surface into zones of illumination
By: by R. Putnin̦š.
Contributors: Latvijas Ǵeōgrafijas Biedrība.
Publisher: Latvijas ǵeōgrafijas biedrības izdevums, Georgraphical Society of Latvia
Published: 1935
Place of publication: Riga
Language: eng
Number of pages: 221
Subjects: Astronomical geography.; Sun -- Rising and setting.