1960Dyadograptus praecursor sp. nov. — Obut, pp. 147, fig. 1:2-2a, b
1964Dyadograptus praecursor Obut — Obut, fig. IV 8
Selection of related publications
Obut, A. M. 1960.
Correlation of some parts of Estonian Ordovician and Silurian deposits according to graptolites.ENSV TA Geoloogia Instituudi uurimusedV,
143-157.