Halley Bay expedition, file of D C Martin '1 IGY Data Flow, General and IGY co-ordinator', minutes and correspondence concerning exchange and circulation of IGY data File from the Royal Society International Geophysical Year expedition to Halley Bay. Filing of D C Martin, assistant secretary of the Royal Society, including correspondence from the IGY controller (Sir A Day). 'Soviet Cables US Report on Satellite; Gives a Timetable' - New York Times Correspondence regarding: Collection and interchange of satellite information; IGC Data sharing/reproduction/data flow/collections; the Paris Meeting (CSAGI/SCG & the WDC Organisation); Microfilm copiers, IGY Geomagnetic Data; 6 monthly catalogue of IGY data, Correspondence regarding coordinator's data flow circular Copy of circular concerning continuing Data Flow Royal Society, British National Committee for the International Geophysical Year reports: IGY data matters discussed at 5th CSAGI meeting 1957-1959