- FondsHoyle - Papers of Sir Fred Hoyle
- SeriesBox 30 - Box 30
- File4 - Early solar system
- Item1 - Kenneth M. Towe, 'Early Precambrian oxygen: a case against photosynthesis', Nature 274 (17 Aug. 1978), pp. 657-661
- Item2 - V.W. Canuto, J.S. Levine, T.R. Augustsson and C.L. Imhoff, 'Oxygen and ozone in the early earth's atmosphere', Precambrian research 20 (1983), pp. 109-120.
- Item3 - J.F. Kasting, K.J. Zahnle and J.C.G. Walker, 'Photochemistry of methane in the earth's early atmosphere', Precambrian research 20 (1983), pp. 121-148.