In Eastern Oregon’s John Day, a 160-year-old building holds one of the biggest collections of traditional Chinese medicine in the world. Kam Wah Chung and Company, once part of a thriving Chinatown, was owned and operated by Lung On and Ing Hay for over half a century. It was a home, a general store, a community center and a medical clinic where Ing Hay served as a beloved doctor to residents across the region. His practice included herbal remed…