00310nam a2200121Ia 4500008004100000082001800041245003000059250001200089260003300101300001300134600002200147650001900169130903s9999    xx            000 0 und d  a546.1.023  L4  aTritium and its compounds  a2nd ed.  aLondonbButterworthscc 1974  axv,822p.  aEvans, E.Anthony.  aTritium dating