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Substantial changes in user searching have been observed over time, including an important trend of the growing use of collection\u2010level search feature. Results also demonstrate differences in the search query lengths, frequencies, and distribution of search categories between the collection\u2010level and item\u2010level searching. The higher occurrence of <jats:italic>place<\/jats:italic> and <jats:italic>concept<\/jats:italic> categories in collection\u2010level user searches than in item\u2010level searches has been consistent over time. The analysis also revealed the prevalence of subject searching (including <jats:italic>concept, object, event, place, class of persons<\/jats:italic>, and <jats:italic>ethnic group<\/jats:italic> search categories) both at the collection level and at the item level.<\/jats:p><jats:p>This study provides empirical data to support digital library developers' decision making regarding information organization in large\u2010scale aggregations of digital collections.<\/jats:p>","DOI":"10.1002\/meet.14504901288","type":"journal-article","created":{"date-parts":[[2013,1,24]],"date-time":"2013-01-24T10:49:23Z","timestamp":1359024563000},"page":"1-4","source":"Crossref","is-referenced-by-count":0,"title":["Longitudinal comparative analysis of item\u2010level and collection\u2010level user searching in a digital library"],"prefix":"10.1002","volume":"49","author":[{"given":"Oksana L.","family":"Zavalina","sequence":"first","affiliation":[]},{"given":"Elena","family":"Vassilieva","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2013,1,24]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.5860\/crl_57_06_514"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1515\/9783110962451"},{"key":"e_1_2_6_4_1","unstructured":"IFLA Study Group on the Functional Requirements for Bibliographic Records. 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