A representation of the sunspot cycle.
Series: Foundation reprint; no. 19
Publisher: Foundation for the Study of Cycles
Published: 1947
Place of publication: Riverside, Conn
Language: eng
Subjects: Sunspots.
Notes: "References": p. 8.
"Presented before the Astronomy Section of the American Association for the Advancement of Science, Richmond, Va., December, 1939."
"Reprinted from the Bell system technical journal, vol. XVIII ... April 1939."