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

193 Ambrosia CCD Spectrum

1930 April 11 meeting of the Royal Astronomical Society

1930 April 16 meeting of the Royal Meteorological Society

1930 April 30 meeting of the British Astronomical Association

1930 December 12 meeting of the Royal Astronomical Society

1930 December 17 meeting of the Royal Meteorological Society

1930 December 19 geophysical discussion

1930 December 31 meeting of the British Astronomical Association

1930 February 14 meeting of the Royal Astronomical Society

1930 February 19 meeting of the Royal Meteorological Society

1930 February 26 meeting of the British Astronomical Association

1930 January 1 meeting of the British Astronomical Association

1930 January 10 meeting of the Royal Astronomical Society

1930 January 15 meeting of the Royal Meteorological Society