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The Art of SEO: Mastering Search Engine Optimization (Theory in Practice) Highlight
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— Eric Enge and Stephan Spencer and Rand Fishkin and and Jessie C StricchiolaWhen using the site: operator, some indexed URLs might not be displayed (even if you use the “repeat the search with omitted results included” link to see the full list). The site: query is notoriously inaccurate. You can obtain a more accurate count of the pages of your site indexed by Google by appending &start=990&filter=0 to the URL of a Google result set for a site: command.
Replicated under Fair Use from The Art of SEO: Mastering Search Engine Optimization (Theory in Practice) by Eric Enge and Stephan Spencer and Rand Fishkin and and Jessie C Stricchiola.