Many libraries offer access to Routledge books through their subscription-based services. If you're affiliated with a university or institution, you can use their library services to access Routledge books for free.
Routledge hosts specific series dedicated to free knowledge: Routledge Open History how to download routledge books for free
If you're unable to find a Routledge book for free, you can request it through your library's interlibrary loan service. This service allows libraries to borrow books from other libraries on behalf of their patrons. Many libraries offer access to Routledge books through