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Amazon Web Service - Your 25th Hour Mate book focuses on AWS concepts at glance.
It is useful book for your journey toward understanding Amazon Web services, certification, interviews and troubleshoot in nutshell.
This book provides pictorial representation about the available services and its implementation. It is concise and to the point book instead of heavy explanation based.
101 Refresher dose, would help you quickly memorise and refresh the AWS services in final hour of your need.