Woods wrote the books in mere days and sold them to pornographic publishers under a variety of pseudonyms. Like many prolific pulp authors, he might have been selling ebooks through Kindle or another self-publishing platform. But while paper books might be harder to distribute, they have one huge advantage over ebooks: as long as an archivist or collector can keep them from falling apart, they’ll be as readable in a century as they will in a year. Keeping ebooks in the historical record is harder.