International Symposium on the Silurian-Devonian Boundary and the Stratigraphy of the Lower and Middle Devonian (3rd 1968 Leningrad, R.S.F.S.R. and Lʹviv, Ukraine)

• Abstracts of the proceedings of the third International Symposium of the Silurian-Devonian Boundary and the Stratigraphy of the Lower and Middle Devonian, Leningrad, USSR, Iuly, (i.e. July) 18-19-20, 1968
• Granit͡sa silura i devona i biostratigrafii͡a silura
• Trudy Tretʹego Mezhdunarodnogo simpoziuma po granit͡s︡e silura i devona i stratigrafii nizhnego i srednego devona