1929 June 19 meeting of the Royal Meteorological Society

1929 June 26 meeting of the British Astronomical Association

1929 Kollaa CCD Spectrum

1929 March 18 geophysical discussion

1929 March 20 meeting of the Royal Meteorological Society

1929 March 27 meeting of the British Astronomical Association

1929 March 8 meeting of the Royal Astronomical Society

1929 May 10 meeting of the Royal Astronomical Society

1929 May 15 meeting of the Royal Meteorological Society

1929 May 29 meeting of the British Astronomical Association

1929 May 3 geophysical discussion

1929 November 20 meeting of the Royal Meteorological Society

1929 November 27 meeting of the British Astronomical Association

1929 November 8 meeting of the Royal Astronomical Society

1929 November1 geophysical discussion

1929 October 30 meeting of the British Astronomical Association

192nausikaa

192nd Meeting of the American Astronomical Society

193 Ambrosia CCD Spectrum

1930 April 11 meeting of the Royal Astronomical Society