Kastler, AlfredHandwritten manuscript signed, four pages (numbered to the upper left corner), 8,25 x 10,5 inch, in French, concerning atomic spectroscopy entitled "Allocation en 3e Congres International de Spectromtrie" (=Allocation in third International Spectrometry Congress), written and signed (on the top of the first page) in black ballpoint ink "Alfred Kastler", with mild intersecting letter folds in nearly very fine condition. Opening: "En vous remerciant de