When looking for primary literary texts in literature an obvious strategy is to search Holmes, BC Libraries' catalog. Try also HathiTrust, comprising over 13 million volumes, more than 5 million of which are in the public domain and fully viewable online. It is one of the largest research library collections in the world. A very high proportion of the public domain titles have dates prior to 1923. One should also search Google Books, another vast repository of online books.