The phrase "documentary record" (lines 20 and 37) primarily refers to

on January 17, 2018


What are the cues that would suggest what the answer is over the other options?

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Randy on June 18, 2018

The only way I found the answer was by looking back at the first paragraph it states that the documents used back then were for military and commercial purposes.

Anita on June 18, 2018

@rweyer ooking back at the first paragraph is exactly the way to approach this. The documentary record is established up front as these documents, which the pollen is supposed to complement.