Quote from the book "Гитлер и стратегия блицкрига. Третий рейх в войне на два фронта. 1937-1943"

Suitable for smartphones, Android tablets, e-readers (except Kindle) and many programs

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Can be opened on any computer

Opens in Adobe Reader

Optimized and suitable for smartphones

Suitable for Kindle e-readers and Android apps

Suitable for iOS devices (iPhone, iPad, iMac) and most reading apps

Perfect for iPhone and iPad

Development of FB2 format