Hello, I am conducting some significant vibration data on propulsion systems. I am looking for vibration data in the Columbia incident. It is disclosed in the report of the incident with citations. However, these citations have disappeared, there are no records of this test data anywhere. Does anyone have any idea where or who I could contact? Nasa has been contacted but unresponsive. I am also looking for anyone who may know a thing or two about this type of problem. I am not allowed to disclose detailed information on my research but enough where you could get the jist of the idea and system workings.Thank You for your time.