Project Gutenberg recently added a feature to their advanced search option that allows you to search on a single term like this. www.gutenberg.org/catalog/world/search Enter your term into the last field named Fulltext. Leave the other fields blank unless you want to narrow your search by language, etc. I used your example "igloo" and got 53 matches-including a poem by Robert Service, stories by Jack London, and a bunch of Arctic travel narratives. Click on the Fulltext Context link off to the side to see your text with the search term highlighted. This search option is labeled "experimental", but it seemed to work really well with this example.