I spotted this post via HackerNews named Google search parameters in 2012.
It is one of the most comprehensive posts explaining what all the various URL parameters in Google’s search URL strings mean.
This post goes through about 75 different URL parameters that either change the search query, refinement, set of results or mean something in terms of tracking or other metrics.
It is broken down by:
Normal Search Query
Advanced Search Operators
Country and Language
Advanced Search Tools
Other Parameters
Unknown Parameters
Matt Cutts of Google replied to the HackerNews thread saying:
The response was pretty classic where one HackerNews user said:
Check out the post at RankPanel.com.
Forum discussion at HackerNews.
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