Rutherford's radio-activity and alpha ray research : the case of a misdated letter / by Thaddeus J. Trenn.
Abstract:
Internal evidence from Rutherford's letter to his mother dated as Aug. 1, 1902 shows it to have been written in February 1902, when he began to write his first book on radioactivity
Ambix Vol. 26 (1979), p. 134-136