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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 | 
					
						
							|  |  |  | 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 | 
					
						
							|  |  |  |   [1900 vs. 1904 Date System](http://support2.microsoft.com/kb/180162). | 
					
						
							|  |  |  |   The workbook's epoch can be determined by examining the workbook's | 
					
						
							|  |  |  |   `wb.WBProps.date1904` property. | 
					
						
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