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_  Introduction  Previous work Graphic methods  Algebraic methods  Method based on expansion of ex _. Calculation of concordant ages___ One sample___-_- Radiogenic Pb207/Pb206 ratio given.--____----____- Common Pb207/Pb206 ratio given Two samples. Amount of contaminating radiogenic lead and its Pb207/Pb206 ratio unknown.  Amount of contaminating common lead and its Pb207/Pb206 ratio unknown.-.Amount of contaminating radiogenic and common lead and the Pb207/Pb206 ratio unknownThree samples.-.- Amount and Pb207/Pb206 ratios of contaminating common and radiogenic lead unknown. __ General equations References cited

Algebraic and graphic methods for evaluating discordant lead-isotope ages