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Are you clear on the meaning of the word "epistemological" (or if you look it up "epistemology")?
That's the first key.
http://www.answers.com/epistemology
and
http://en.wikipedia.org/wiki/Epistemology
Then you need to be clear on who Eugen Weber is and what he's known for:
http://en.wikipedia.org/wiki/Eugen_Weber
Now ... what do you think this question is asking?