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								### Workbook Object
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								`workbook.SheetNames` is an ordered list of the sheets in the workbook
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								`wb.Sheets[sheetname]` returns an object representing the worksheet.
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								`wb.Props` is an object storing the standard properties.  `wb.Custprops` stores
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								custom properties.  Since the XLS standard properties deviate from the XLSX
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								standard, XLS parsing stores core properties in both places.
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								`wb.WBProps` includes more workbook-level properties:
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								- Excel supports two epochs (January 1 1900 and January 1 1904), see
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								  [1900 vs. 1904 Date System](http://support2.microsoft.com/kb/180162).
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								  The workbook's epoch can be determined by examining the workbook's
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								  `wb.WBProps.date1904` property.
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