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A tire carrier apparatus for use in conjunction with a vehicle undercarriage and comprising frame means pivotally mounted to the undercarriage of the vehicle, crank arm and cooperating bell crank… (More)
The advantages of Drosophila which have made it ideal for many kinds of genetic research are combined in Drosophila pseudoobscura with the advantage of an ecology which limits it to areas… (More)
The morphological constancy of sympatric species may be preserved despite compatibility and hybridization sufficient to allow gene flow, so long as the equilibrium of competition is maintained. Such… (More)