The 900 Days (Audio Book)

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Hey guys. Been checking around for a few days now, and I can't find this book in Audio format. It's for a friend with some disabilities, so they can't just go and borrrow the book from a library, or read it very well, for that matter.

The book is called The 900 Days, The Siege Of Leningrad - Author, Harrison E. Salisbury

Any help on this front would be appreciated. Thanks in advance!