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We report a new determination of the strange quark contribution to the proton's magnetic form factor at a four-momentum transfer Q 2 =0.1 (GeV/c) 2 from parity-violating e–p elastic scattering. The result uses a revised analysis of data from the SAMPLE experiment which was carried out at the MIT-Bates Laboratory. The data are combined with a calculation of the proton's axial form factor...