Archive.org hosts several iterations of the OED, ranging from its earliest volumes to more recent reference versions:

Go to the website and use the search bar.

Originally published in fascicles (parts) starting in 1884, the full 12-volume set was completed in 1928 under the title A New English Dictionary on Historical Principles (NED) . It was reissued in 1933 as the Oxford English Dictionary . Because these early editions are out of copyright, they are fully accessible and downloadable as PDFs on Archive.org.