This here is the Glass Slide Collection of John Voss, Ph.D. (1895 – 1948) Plant Ecologist, Principal and Teacher at Manual Training High School, Peoria, Illinois and hobbyist photographer. John Voss, in the late 1930s, took a series of grand photo tours of Civil War Sites, to be used for educational purposes at Manual Training High School. A collection of John’s photographs were published, entitled “Illinois Wild Flowers.”