Letter to Simon Flexner, September 1, 1904
Letter to Francis John Shepherd, 1902
Letter to Abraham Jacobi, 1902
Letter to Rachael Bonner, August 19, 1904
Letter to Francis John Shepherd, 1902
Letter to Humphry Davy Rolleston, September 14, 1902
Letter to Henri Amédée Lafleur, September 4, 1902
Letter to Francis John Shepherd, 1902
Letter to Thomas R. Boggs, August 23, 1902
Letter to Charles Ferdinand Martin, August 1902