Which process is used by both a historian and an archaeologist in their work?

Both Historian and Archaeologist use hard evidence in their evaluation.

Explanation:

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the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain

bro where is your chart