Was there a ‘medieval warm period’, and if so, where and when?

@article{Hughes1994WasTA,
  title={Was there a ‘medieval warm period’, and if so, where and when?},
  author={Malcolm K. Hughes and Henry F. Diaz},
  journal={Climatic Change},
  year={1994},
  volume={26},
  pages={109-142}
}
It has frequently been suggested that the period encompassing the ninth to the fourteenth centuries A.D. experienced a climate warmer than that prevailing around the turn of the twentieth century. This epoch has become known as theMedieval Warm Period, since it coincides with the Middle Ages in Europe. In this review a number of lines of evidence are considered, (including climatesensitive tree rings, documentary sources, and montane glaciers) in order to evaluate whether it is reasonable to… 
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