I don't think this list is as famous as you assume it to be. The only "Carl Sagan reading list" I managed to find [0] is apparently his personal TODO note (books he plans to read, but haven't at the moment of writing). Which obviously isn't the same thing as "his famous reading list for students".

[0] https://www.sciencealert.com/get-inspired-by-carl-sagan-s-am...