Adobe acrobat reader 7.0 User Manual

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Saving documents as text
If you have large amounts of text to copy, you can use the Save As Text command instead 
of the Select tool. However, keep in mind that all the text in the document is copied, 
including any headers, footers, captions, and footnotes. After you paste the saved text into 
the new document, make sure that you clean it up, deleting or moving any text that's out of 
place.
To save a document as text:
1.  Choose File > Save As Text.
2.  Specify the name and location of the file, and then choose Save. After you save it, you can 
open it in any text editor or word-processing application to clean up the text.