Results from OleDbConnection.GetSchema("Tables")

I am using C# and ADO.NET to read an Excel workbook with multiple worksheets. When I use the code below, I get multiple entries for each sheet.

For example, I have a sheet named "Plate_2". When I do the GetSchema call, I see entries for "Plate_2" and one for "Plate_2$".

More confusing, for the sheet named "Plate_3", I have "Plate_3", "Plate_3$", and "Plate_3$_".

Which of these is the worksheet? Why are there threee different entries? What do the differences indicate? Are there any other funky things like "Print_Area" which I should expect to see?

Thanks,
David

[Code]
        public static string LoadWorkbookSchema(string workbookPath, ref DataTable dtWorksheets)
        {
            try
            {
                using (OleDbConnection connection = GetWorkbookConnection(workbookPath))
                {
                    dtWorksheets = connection.GetSchema("Tables");
                }
                foreach (DataRow dr in dtWorksheets.Rows)
                {
                    if (dr["TABLE_NAME"].ToString().EndsWith("Print_Area"))
                        dr.Delete();
                }
            }
            catch (Exception exception)
            {
                return exception.Message;
            }
            return "";
        }


        public static OleDbConnection GetWorkbookConnection(string WorkBookPath)
        {
            // Note that IMEX=1 was added to eliminate problems with data in the "9th-plus line"
            // having a different data format than the first 8. dwr
            string connectionString =
                string.Format(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=""Excel 8.0;HDR=YES;IMEX=1""",
                    WorkBookPath);

            OleDbConnection connection = new OleDbConnection(connectionString);
            connection.Open();
            return connection;
        }


[/Code]