1. When doing a keyword search in Library Search include terms that describe primary sources such as: personal narratives, diaries, letters, correspondence, maps, pictorial works, memoirs. Even adding the term "sources" to your search can help limit your results to primary sources.
2. Do an author search in Library Search using the name of a person who was instrumental in the event/time period being researched.
3. In the advanced keyword search in Library Search limit the date range for when the material was published to the dates an event took place.