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Measurements of the total cross section differences a-j.(^Ca)-a^C^^Ca) and o-pC^^Ca) -(TTi^^Cd) are reported for positive and negative pions. Optical-model calculations are used to extract values of the rms neutron radius difference for each isotope pair. For ^Ca-^^Ca the deduced radius difference agrees with the results of recent cK-particle and proton scattering experiments but is smaller than values predicted from Hartree-Fock calculations.