The Kindle makes a listing of all your files as long as they are located in the proper folders. Your ebooks would be in the document folder on your SD card. There is also an Audible folder and an MP3 folder for the appropriate files.
In the Kindle listing it will indicate in a small box underneath the title the location of the file: Kindle, SD Card, or Amazon. Your choices for sorting the list are fairly primitive: Most Recent, Title, and Author. If you have a lot of books use the search function to find the particular book you want.
What I do is move the book from the SD Card to the Kindle when I read it to conserve the battery.
HTH
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