This image begins a nearly eight-year attempt to start and then finish a complete Elasmosaurus skeletal.

Citations:

Augusta, J., & Burian, Z. (1964). Prehistoric sea monsters. P. Hamlyn.

Callaway, J. M., & Nicholls, E. L. (Eds.). (1997). Ancient marine reptiles. Academic Press.
[Ch. 6 and 7.]

Carroll, R. L. (1988). Vertebrate Paleontology And Evolution. W. H. Freeman and Company.

Ellis, R. (1985). The book of whales. Alfred a Knopf Inc.

Everhart, M. J. (2017). Oceans of Kansas: a natural history of the Western Interior Sea. Indiana University Press.
[Ch.7.]