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Atlantosaurus immanis

What happened to this taxon? Is it lumped with anything else (dinodata.org says 
Apatosaurus, but not by whom or why, so not sure if it's true)? Couldn't find 
much info on it beyond the original Marsh paper, but it sounds pretty large -- 
2.5 meter femur -- so I wonder why I've never heard of it before.