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- Red Hat Certified System Administrator & Engineer
- Red Hat Enterprise Linux 6 Administration
- Red Hat Enterprise Linux 6 Essentials
- Red Hat Enterprise Linux 8 Essentials
- Red Hat Enterprise Linux 8: Desktops and Administration
- Red Hat Enterprise Linux Administration Unleashed
- Reflections on Programming Systems
- Relayd and Httpd Mastery
- Reliable Distributed Systems
- Reliable Software Technologies – Ada-Europe 2017
- Requirements Engineering and Management for Software Development Projects
- Research in Attacks, Intrusions, and Defenses
- Requirements Engineering and Management for Software Development Projects
- Research in Attacks, Intrusions, and Defenses
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- RHCSA Red Hat Enterprise Linux 8
- RHCSA Red Hat Enterprise Linux 8 (UPDATED)
- Robot Operating System (ROS)
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