%0 Journal Article %T Parton Densitites at High-x %A S. Kuhlmann %A J. Huston %A J. Morfin %A F. Olness %A J. Pumplin %A J. F. Owens %A W. K. Tung %A J. J. Whitmore %J Physics %D 2000 %I arXiv %X Reliable knowledge of parton distributions at large x is crucial for many searches for new physics signals in the next generation of collider experiments. Although these are generally well determined in the small and medium x range, it has been shown that their uncertainty grows rapidly for x>0.1. We examine the status of the distributions in light of new questions that have been raised about "large-x" parton distributions, as well as recent measurements which have improved the parton uncertainties. %U http://arxiv.org/abs/hep-ph/0007141v1