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...ss. The new system replaced a fixed location system developed by [[Thomas Jefferson]]. By the time of Putnam's departure from his post in 1939, all the classes

|title=Hydrogen|publisher=Jefferson Lab |last2=Rupprecht|first2=J.|last3=Bader|first3=K.-P.|last4=Thomas-Hall|first4=S.|last5=Schenk|first5=P. M.|last6= Finazzi|first6=G.|last7=Han