What kind of documents are these? when were they written? why were they written? document d and e?

I cant see the doc for the question

Answer: Document D is from a book, named Dust Bowl: The Southern Plains in the 1930s. It was wri±en in 1979 and lets us know how the US had the Dust Bowl coming and Document E, is also a book, named The Dust Bowl: An Agricultural and Social History. It was published in 1981 and explains some factors that contributed to the crea²on of the Dust Bowl.