Search only visited pages in normal google search

It appears that you can search just visited pages (the Google Web History, "google.com/history) by putting this:

• tbs=whv:1
  

on the end of the query string. eg: A plain search for "Test" (all pages) gives the query string

• http://www.google.com/search?q=test&hl=en&sa=X&tbo=1

while if we add the above we'll get only pages in our search history:

• http://www.google.com/search?q=test&hl=en&sa=X&tbo=1&tbs=whv:1

There's more to it than this, but this might be useful.