?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aulast=Marsh&rft.au=Marsh%2C+Gwyneth+Ann&rft.aufirst=Gwyneth+Ann&rft.date=2008&rft.tpages=321&rft.title=Illustrating+Primary+Science+%3A+A+Teachers+Use+of+Representations&rft.inst=Institute+of+Education%2C+University+of+London&rft.degree=Doctoral