Click on Business & Company Information and from the last category, International Trade, you can find useful information from the vast PIERS (Port Import Exports Reporting Service) database of all the manifests of vessels discharging cargo at approximately 62 continental U.S. seaports, and loading cargo at 120 continental U.S. seaports.
Search results are provided to registered users for a transaction-based fee, but registration is not required to explore the databases and view sample articles and reports.