Convert aa files to mp3

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Project Budget (USD)
$30 - $250

Project Description:
I have almost 35 aa files from audible.com that I did buy from them.
I want to get those files in mp3 format and similar file size as the aa files.
Here are some links I have found that are about this but I havent tested it yet:
http://www.filbar.org/weblog/convert_audible_files_to_mp3
http://www.chuckegg.com/how-can-i-convert-audiblecom-aa-files-to-mp3-audio-files/

Can anyone convert those files for me?

Skills required:
Audio Services, Windows Desktop
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Project posted by:
PalmInfo Iceland
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