Ruth RobersonPhone: 651/757-2672Email: ruth.roberson@state.mn.us Completed Projects TitleYearReport #ResearcherMoisture Retention Characteristics of Base and Sub-base Materials20052005-06 GuptaMn/ROAD TDR Evaluation and Data Analysis20042004-15 WangEvaluation of Water Flow Through Pavement Systems20022002-30 Birgisson