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All of the Gulf-Wisconsin pendulum observations by the group at the University of Wisconsin are discussed. None of the tables of reductions to the periods are presented, as they are merely tedious and contribute nothing to the analysis. The policy adopted in this paper of removing tares and systematic effects from pendulum results will no doubt arouse some controversy. Interpretations of results are kept as simple as possible. Sufficient Gulf-Wisconsin data are presented to permit others to make their own interpretations.

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