| http://www.w3.org/ns/prov#value | - ary and secondary sources for reconstructing the past, such as documents, letters, diaries, maps, textbooks, photos, and other sources.Research and analyze past periods, events, and issues, using a variety of primary sources (e.g., documents, letters, artifacts, and testimony) as well as secondary sources; validate and weigh evidence for claims, and evaluate the usefulness and degree of reliabilit
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