What kind of nonfiction source did the author most likely use to help make the elements in the story realistic?

he is honest with congress and america about the difficulty of the war ahead.

son.

one of the central themes of edward abbey's work has been his staunch opposition to the glen canyon dam on the colorado river that created lake powell, destroying stunning scenery and wildlife habitat, endangering many rare species of fish and animals, and also irreparably destroying many important archaeological sites which provided information about the early inhabitants of the united states.