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Dear Friends,
I'm looking for the following papers of plesiosaurs:

    Schumacher, Bruce A; 2007; A new polycotylid plesiosaur (Reptilia; 
Sauropterygia) from the Greenhorn Limestone (Upper Cretaceous; lower upper 
Cenomanian), Black Hills, South Dakota; The Geological Society of America 
Special Paper 427

    Vincent, Peggy, Bardet, Nathalie and Morel, Nicholas; 2007; An elasmosaurid 
plesiosaur from the Aalenian (Middle Jurassic) of Western France; N. Jb. Geol. 
Palaont. Abh.; 243(3) pp.363-370; Stuttgart

    Z Gasparini, L Salgado and A. Parras 2007. Late Cretaceous plesiosaurs from 
northern Patagonia, Argentina. Geological Magazine 42, 185-202.

   Großmann, Fransiska; 2007; The Taxonomic and Phylogenetic Position of the 
Plesiosauroidea from the Lower Jurassic Posidonia Shale of South-West Germany; 
Palaeontology; 50(3) pp.545-564

    Faux, CM, and K Padian. The opisthotonic posture of vertebrate skeletons: 
postmortem contraction or death throes? Paleobiology 33: 201-226.

Ing. Yasmani Ceballos Izquierdo    <yceballos@uci.cu>