Two historical accounts that agree may still derive from the same original report. Cross-referencing means tracing each account back to its source, comparing the details, and recording what remains uncertain.
A practical comparison
Begin with a claim you can state in one sentence, such as a reported mine location or the date a building existed. For each source, record its creator, date, purpose, and the exact passage. Mark whether the writer witnessed the event, repeated another person, or interpreted a document later. The Library of Congress guide to primary sources recommends examining point of view and historical context before drawing conclusions.
Put the sources side by side. Separate details on which they agree from details that appear only once. Check whether two newspaper stories used the same wire report; if so, they are not independent corroboration. Look for a record made for a different purpose, such as a deed, census entry, map, or court file.
State the result honestly
Write what the records support, what they contradict, and what they cannot establish. A conflict may reflect a changed place name, an approximate date, or a genuine disagreement. Do not resolve it by choosing the more exciting account. The National Archives research guide helps locate the underlying records and document where each item came from.
Keep a citation for each record so another reader can repeat the comparison.
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