This online exhibit is from the National Museum of Health and Medicine. It was originally an exhibit from 1997 and documented the efforts of pathologist Dr. Jeffrey Taubenberger to recreate the 1918 influenza virus.
This Library of Congress collection has a few photographs, flyers, and letters from 1918 focused on the pandemic. The above flyer is an example of the archival material this small collection contains.
This online exhibition contains letters, charts, photographs, and newspapers from 1918 documenting the pandemic in America. The above letter is one of several primary documents included in the exhibit.
The National Archives have put together a collection of documents centered around the 1918 Influenza Pandemic, including a book of patient names from South Beach, Washington.