"In 1918 – 1919, a flu epidemic infected about 500 million people worldwide. Nearly 1/3 of the world’s population. The U.S. alone endured 675,000 deaths. In an effort to protect citizens, many communities around the country implemented preventative measures, including wearing masks. Here, Harley-Davidson dealers can be seen taking this precaution during those challenging times as they attend a 1919 regional dealer conference in San Francisco."