Dr. Charles Gradison Keenan ID: 1931 | This file appears in: Yellow Fever in Huntsville, Texas Dr. Keenan's immunity allowed him to benefit several patients without the fear of contagion. | Source: Photography courtesy of Ancestry.com. Download Original File SourcePhotography courtesy of Ancestry.com. "Dr. Charles Gradison Keenan" appears in: Yellow Fever in Huntsville, Texas
