How to transfer Kindle Books to Kindle devices via USB
Transferring a library eBook to your Kindle works just like any other Kindle Book transfer would. When your Kindle is plugged into your computer with a USB cable, it will appear as a removable storage device. Follow Amazon's instructions to get started.
Note: Kindle Books are currently available for US libraries only.
Keep in mind that most Kindle devices and all Kindle reading apps support wireless delivery, sending the book directly to your device automatically.
Note: Certain publishers' titles are not available for over-the-air delivery. If over-the-air delivery is not available, you will need to download the title, then load it on to your Kindle over USB.