Alvin, K.L., Barnard, P.D.W., Harris, T.M., Hughes, N.F., Wagner, R.H. & Wesley, A., 1967. Chapter 6. Gymnospermophyta. In W.B. Harland, C.H. Holland, M.R. House, N.F. Hughes, A.B. Reynolds, M.J.S. Rudwick, G.E. Satterthwaite, L.B.H. Tarlo & E.C. Willey (eds.), Foss. Rec., Oct 1967: 247-268.
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