Searched for https://atom.archives.unesco.org/13th-bureau-meeting-22-24-april-1959%3Bisad?sf_culture=en 
Note: This calendar view maps the number of captures of https://atom.archives.unesco.org/13th-bureau-meeting-22-24-april-1959%3Bisad?sf_culture=en, not how many times the site was actually updated.
Look Up URL in general Internet Archive web collection.