Since 1971, Project Gutenberg has devoted itself to digitizing books in the public domain, that is, those published before 1923. At first, volunteers transcribed books, retyping them into computers. Now, machines capture text via optical character recognition (OCR.) But these texts contain errors that are best caught by human eyes.
Here’s where you come in. Register at Project Gutenberg to compare the scanned text to the image of a page. “Once all the pages have completed these steps, a post-processor carefully assembles them into an e-book…and submits it to the Project Gutenberg archive.” Project Gutenberg invites us all to join them in “preserving the literary history of the world in a freely available form for everyone to use.”