Beschreibung
Raytech Equipment Company, USA, The Story of Flourescence, An explanation of ultraviolet flourescence with experiments an a descriptive list of flourescent minerals, 1965, 60 S., mit Abb. #64329
Raytech Equipment Company, USA, The Story of Flourescence, An explanation of ultraviolet flourescence with experiments an a descriptive list of flourescent minerals, 1965, 60 S., mit Abb. #64329