Searching public domain works from a particular scholar This is a general question, but I have a specific example in mind.

I'm interested to search Francis Galton's works to see if he ever mentioned Condorcet. Galton died in 1911 so all his works would now be in public domain.

So far the best solution I could find was a google search targeted towards a website that contains a lot of his works.

https://www.google.com/search?q=condorcet+site:http://galton.org

Is there a better way?
You might like to try Google Scholar, e.g., 

https://scholar.google.co.uk/scholar?as_yhi=1911&amp;q=Condorcet+author%3AFrancis+Galton