Remove duplicate ebooks

I recently downloaded a SHITLOAD of ebooks (10K dutch ebooks) from differen sources. Most of them are unique, but a lot (probably 2K or so) are duplicates.
They are not 100% duplicates so itunes or the programs I tried cant find them.
CopyTransTuneTastic finds a lot of them, but is SO uneasy to use and takes hours to manualy delete the duplicates one by one with a lot of steps.
Does anyone know a program to remove these duplicates (just like CopyTransTuneTastic)?
Answer #1
Can’t think of any names of programs, but I’d find something that can search by hash to identify duplicates and remove them that way.
Answer #2
Use Beyond Compare 3 Professional edition, you can compare their CRC, Binary and supports many more custom rules!