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Read the assignment again. Familiarize yourself with the years and topics that are off limits. Look through past American Journal of Physics Resource Letter examples at the link below. Remember that you cannot use any that have been published in the past 5 years!
Resource Letters are guides for college physicists, astronomers, and other scientists to literature, websites, and other learning aids. Each Resource Letter focuses on a particular topic and is intended to introduce non-specialists to this field. Resource Letters are not meant to be exhaustive and complete but rather serve as general resource guides to topic areas in physics.