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Vertebral spines on sauropods...

I was checking out Stephen Czerkas' drawing of _Diploducus_, and the dorsal spines in the reconstruction. I also remember seeing similar spines on a drawing by Greg Paul of a _Brachiosaurus_ for The Dinosaur Encyclopedia. Is it generally accepted that many sauropods had such structures? How similar are these spines to those on, say, an _Amargasaurus_ or _Dicraeosaurus_?
-Chris Srnka