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We document the creation of a data set of 16,627 archived web pages, ormementos, of 3,698 unique live web URIs (Uniform Resource Identifiers) from 17public web archives. We used four different methods to collect the dataset.First, we used the Los Alamos National Laboratory (LANL) Memento Aggregator tocollect mementos of an initial set of URIs obtained from four sources: (a) theMoz Top 500, (b) the dataset used in our previous study, (c) the HTTP Archive,and (d) the Web Archives for Historical Research group. Second, we extractedURIs from the HTML of already collected mementos. These URIs were then used tolook up mementos in LANL's aggregator. Third, we downloaded web archives'published lists of URIs of both original pages and their associated mementos.Fourth, we collected more mementos from archives that support the Mementoprotocol by requesting TimeMaps directly from archives, not through the Mementoaggregator. Finally, we downsampled the collected mementos to 16,627 due to ourconstraints of a maximum of 1,600 mementos per archive and being able todownload all mementos from each archive in less than 40 hours.

Collecting 16K archived web pages from 17 public web archives