How an Amazon Kindle 8th generation 4GB, looks on first plug on windows 7! 
–
Covnert PDF2MOBI (aka kindle format)
–
Download FREE ebooks from amazon direct
ref - https://ebookfriendly.com/download-free-kindle-books/
–
800 Free eBooks for iPad, Kindle & Other Devices
http://www.openculture.com/free_ebooks
–
Greek eBooks
http://www.typosthes.gr/gr/perissotera/ViralNews/article/80337/dorean-ilektronika-vivlia-sta-ellinika-gia-katevasma-kai-online-diavasma-/ http://www.free-ebooks.gr/gre/ebooks/index http://eranistis.net/ https://www.tsouk.gr/dorean-vivlia-pdf-ellinika-anglika/ https://tovivlio.net/
https://www.ianos.gr/proionta/vivlia.html?book_type=15
http://bell.gr/ebooks.asp?l=&curpage=1
https://www.psichogios.gr/site/Books/Categories?ebooksonly=1
https://www.kastaniotis.com/ebooks/free/
https://www.dioptra.gr/ebooks/
http://www.patakis.gr/ViewShopCategory.aspx?Id=150651
https://www.gutenberg.org/browse/languages/el
https://www.openbook.gr/tag/Kindle-mobi/
Greek Paid - by Εθνική Βιβλιοθήκη της Ελλάδος
http://www.e-bookshop.gr/books
https://www.ebooks4greeks.gr/ (via calameo)
World Wide
ref - https://www.pipiscrew.com/2018/05/google-scholar/
–
File formats, applications and converting PDF to AZW3 or mobi
file formats :
mobi is Mobipocket e-book format is based on the Open eBook standard using XHTML AZW files debuted with the first Amazon Kindle in 2007 AZW3 supports a subset of HTML5 and CSS3 features, AZW3 is epub with an amazon wrapper, introduted in 2011
amazon Kindle for all OS - https://www.amazon.com/kindle-dbs/fd/kcp
amazon Kindle Previewer (simulator) - https://www.amazon.com/gp/feature.html?docId=1000765261
amazon freeware (command line) - https://www.amazon.com/gp/feature.html?docId=1000765211
freeware - https://calibre-ebook.com/
paid - https://www.epubor.com (faster conversion)
origin - https://www.pipiscrew.com/?p=14375 amazon-kindle