Sometime I go on clicking Next Next in Google in the end G stopped me at Page 100 but now even for big sites like Yahoo, Wikipedia, MSN & for itself Google put an end at 50-70 pages.
After that a message is displayed:
In order to show you the most relevant results, we have omitted some entries very similar to the 687 already displayed.
If you like, you can repeat the search with the omitted results included.
I can believe MSN, yahoo may have some similar/repeated results but this can't be possible for Wikipedia (results ending at Page 69). Does Google think Wiki's results are also similar/repeated.