1929 February 15 geophysical discussion

1929 February 20 meeting of the Royal Meteorological Society

1929 February 27 meeting of the British Astronomical Association

1929 February 8 meeting of the Royal Astronomical Society

1929 January 11 meeting of the Royal Astronomical Society

1929 January 18 geophysical discussion

1929 January 2 meeting of the British Astronomical Association

1929 January 30 meeting of the British Astronomical Association

1929 June 14 meeting of the Royal Astronomical Society

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