Note: This calendar view maps the number of captures of http://www.unesco.org/new/en/communication-and-information/flagship-project-activities/memory-of-the-world/register/full-list-of-registered-heritage/registered-heritage-page-5/libri-prohibiti-collection-of-periodicals-of-czech-and-slovak-samizdat-in-the-years-1948-1989/, not how many times the site was actually updated.
Look Up URL in general Internet Archive web collection.