Thanks to Flickr user mixtara, once again, for the amazing ability to recognize this location. The photo was taken in Dubna, north of Moscow. The Hotel Dubna is in the background.
Members of the IEC are apparently walking from tour buses to a speed tour boat (rocket) which would take them back down the Moscow Canal.
On the left side of the path you can see the same baby, mother and grandmother as in the photo above, with another woman sitting with them now.
Taken by my grandfather David C. Cook on a visit to Moscow for a meeting of the International Electrotechnical Commission. Development stamp is June, 1969. Scanned from an unlabeled Kodachrome slide number 16 in a box labeled "Russia."