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Stefan Wintermeyer

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Stand Alone

Learn Rails 5.2: Accelerated Web Development with Ruby on Rails
Learn Rails 5.1 Part I Version 5.1.0, 2016-04-16
Practical Asterisk 1.4 and 1.6
Ruby on Rails 4.0
Ruby on Rails 4. 2 for Autodidacts
Learn Rails 5.2
Practical Asterisk 1.4 and 1.6 From Beginner to Expert