Which are secondary sources? Select three options.

documentary about the Great Depression
textbook chapter about economic markets
book of historical fiction written about Dust Bowl refugees
letter home written by someone during the Great Depression
signed federal law aiding people affected by the Great Depression

For a historical research project, secondary sources are generally scholarly books and articles. A secondary source interprets and analyzes primary sources. These sources are one or more steps removed from the event. Secondary sources may contain pictures, quotes or graphics of primary sources.

Hope this helps!

Please give brainliest!

the answer is a. harriet tubman was a nurse on the battlefield.