“Chemical X” was used widely in the United States as an inse…

“Chemical X” was used widely in the United States as an insecticide for many years. Eventually, research showed “chemical X” was a persistent chemical that bioaccumulated and biomagnified in the environment. The chemical was later banned from use in the United States.   You are writing a report on the history of chemical X in the United States. Your instructor says that all sources used for your report must be primary sources. Which of the following would you choose?