{"id":"003023400","type":"article","title":"Comments Concerning Recent Fieldwork on Roman Maritime Concrete","publisher":"Blackwell Publishing Ltd.; Nautical Archaeology Society","publisher-place":"New York","pages":"188-193","container-title":"The International Journal of Nautical Archaeology, 40 (2011","author":[{"family":"Gianfrotta","given":"Piero Alfredo"}],"issued":{"raw":"2011"}}