How do I import recepient addresses from e-mails previously saved on a local folder?

I recently re-installed my operating system due to which I had to freshly re-install Thunderbird. Before the OS uninstallation/re-installation I had made sure to export all my important e-mails from Thunderbird and saved them to a back-up hard drive. But I forgot to save all the e-mail addresses on my address book. But many of them are on one of the saved e-mails in the Bcc section of the e-mail (it being a multiple recipient e-mail to undisclosed recipients). Is there a way I can import them to my new Thunderbird address book? Thanks.