Thread:TheGreatEye/@comment-7694700-20130605012817/@comment-1967894-20130605154755

It is scattered around the Internet. You simply use Google to search for "Toaru Majutsu no Index manga raws" or "Toaru Kagaku no Railgun manga raws" and download (if applicable) the untranslated raws. They are usually contained in archive files such as .rar. or .zip, so you need an application that opens and extracts them.