Gustav Spörer (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Gustav Spörer" in English language version.

refsWebsite

Global rank English rank

2books.google.com

3^rd place

3^rd place

books.google.com

Patrick Moore (1968). "Friedrich Wilhelm Spoerer". The Sun. W. W. Norton & Company. p. 113. ISBN 0393062767.
"The Valz Prize". Popular Astronomy. 21: 384. 1913.