As with most large companies, that information is not easy to come by. Imagine the amount of people that would bombard a recruiter if that information was made public. You can always send a letter or call professional recruitment, and see what they say...but I would venture to guess it wouldn't prove too useful. They would likely tell you that all available positions are online and to look there to apply. The only real way to get face time with a recruiter without applying is to establish a contact somewhere and see if they can get you in touch.