Fossil plants, Vol. 1: [A text-book] for students of botany and geology

by A. C. Seward

[45] W. R. W. Stephens, Life of Freeman, p. 132, London, 1895.

[46] Rothpletz (94).

[47] Heim (78).

[48] Geikie (93), p. 706.

[49] Hughes (79), p. 248.

[50] Whitney and Wadsworth (84).

[51] Murchison (72), p. 5.

[52] Kayser and Lake (95), p. 88.

[53] Kidston (94).

[54] Geikie (93), p. 825.