Here's a Google Search Tip. There might be some useful genealogy PDF files available about a surname that you are working on. To find out enter the following in the Google search box (where "surname" is replaced with the surname of interest.) Enter the word "genealogy" to focus the search on our topic of interest.
filetype:pdf surname genealogy
You can search for other file types too. For example, replace "pdf" with "rtf" to search for Rich Text Files. Get the idea?