Programme-evolution in the graptolites

[1] BATHER FA, 1921, BRIT ASS SCI CARDIFF, P61

[2] BULMAN OMB, 1932, ARKIV ZOOL A, V24

[3] DENEY A, 1912, BRIT ASS SCI PARTSMO, P277

[4] DUEBDEN JE, 1919, J GENET, V9, P131

[5] EISEL R, 1912, JB GESELL FREUND NAT, P27

[6] ELLEN GL, 1902, PAL SOC LONDON

[7] ELLEN GL, 1923, BRIT ASS ADV SCI LIV, P83

[8] Elles G. L., 1922, Proceedings of the Geologists' Association London, V33, P168, DOI 10.1016/S0016-7878(22)80007-9

[9] FENTON CL, 1931, PUBL WAGNER FREE I S, V2

[10] JONES OT, 1928, MEN GEOL SURVEY 5

[1] BATHER FA, 1921, BRIT ASS SCI CARDIFF, P61

[2] BULMAN OMB, 1932, ARKIV ZOOL A, V24

[3] DENEY A, 1912, BRIT ASS SCI PARTSMO, P277

[4] DUEBDEN JE, 1919, J GENET, V9, P131

[5] EISEL R, 1912, JB GESELL FREUND NAT, P27

[6] ELLEN GL, 1902, PAL SOC LONDON

[7] ELLEN GL, 1923, BRIT ASS ADV SCI LIV, P83

[8] Elles G. L., 1922, Proceedings of the Geologists' Association London, V33, P168, DOI 10.1016/S0016-7878(22)80007-9

[9] FENTON CL, 1931, PUBL WAGNER FREE I S, V2

[10] JONES OT, 1928, MEN GEOL SURVEY 5