For your project, you need to search for and select primary sources. When you're looking for primary sources, look for sources that shed light on the topic you've chosen. If you're investigating the environmental impact of the atomic bomb, you'll want to look for primary sources that touch on that topic or add some information to that conversation. You might seek out reports on the environmental effects done in the years after, letters from people who witnessed the environmental impact, or images of the damage.
The best place to look for primary sources can vary widely depending on the topic you're interested in and the sources you would like to use. We've selected a few of the library's databases below that include primary sources. Want more? Check out the longer list of primary source collections in the History research guide.