Observations solaires. - Cluj (Romania). Observatorul Astronomic; Observatorul Astronomic București (Bucarest : Académie de la république socialiste de Roumaine)
Mode of access: Internet.
Issued by Secteur solaire, Observatoire de Bucarest.
No. 1-2 issued by Observatorul Astronomic, Cluj.
Keywords: Sun -- Rotation; Sun -- Tables