Preliminary note on the spores in situ, of Coal Pecopterids; paleobotanic and stratigraphic implications. (In: Colloqium on the Stratigraphy of the Carboniferous, Compte Rendus, 8th Reunion CIMP. M.Streel and R.H.Wagner, editors)
Foreign title:
Note preliminaire sur les spores in situ de quelques Pecopteridinees Houilleres. Implications Paleobotaniques et stratigaphiques.