Celebrating in Bulgaria the 24th anniversary of the socialist revolution: a festive demonstration in Sofia. Austria. UN Conference on the Exploration and Peaceful Uses of Outer Space in Vienna. Austria. Opening of the Soviet exhibition "Conquest of Space" in Vienna. Departure of American military aircraft from the Itazuk military base in Japan, heading for Vietnam. Hungary. First Budapest Fair for Hungarian Products. View of the new reservoir and Pöhl dam in the GDR. Recreation center on the bank of the reservoir. Italy. Ascent of tourists by cable car to Mount Vesuvius. Aviation holiday in Canada. International motorboat competition in England. Speech by the Bulgarian singer Nikolai Gyaurov (synchronously).