Periodic solar variation.
APA Citation
Abbot, C. G. (Charles Greeley). (1955). Periodic solar variation. Washington: Smithsonian Institution.
MLA Citation
Abbot, C. G. (Charles Greeley), b. 1872. Periodic Solar Variation. Washington: Smithsonian Institution, 1955.
Warning: These citations may not always be complete (especially for serials).