I was in my local gay bookstore yesterday and I picked up this book called "Mr Long: The Models of Third World Studio". I've never heard of Third World Studio but apparently they were around in the mid 70s to 80s and did a lot of work with super hung black guys.
I have found a website with a LOT of the pictures on here
I've uploaded a couple of pics to save all that web browsing. These are some truly massive schlongs!