As part of my dissertation research and general research program focused on horned dinosaurs, I traveled to the Royal Ontario Museum (ROM, Toronto, Ontario, Canada) in the summer of 2006 for a few days of research. The notes were typed in Microsoft Word, and are presented in unedited format on the following pages. Taxa discussed in these notes include specimens referred to Centrosaurinae, Centrosaurus, Chasmosaurus, Triceratops, Anchiceratops, and the ankylosaur Panoplosaurus.