Volume 10 of Developments in Applied Spectroscopy presents a collection of twenty selected papers presented during the 10th National lleeting of the Society of Applied Spectroscopy held in St. Louis, Oct. 18-22, 1971. The 10th National Meeting was sponsored by the St. Louis Section, Society of Applied Spectroscopy in cooperation with Baltimore-Washington, Chicago, Cleveland, Cincinnati, Houston, Intermountain (Idaho Falls), Kansas City, New England, Niagra Frontier, Northern California, North Texas, Pittsburgh and Rocky Mountain (Denver) Sections of the Society and combined with the 22nd...