Further Reading
- Mark Wade. "Universal Rockets". friends-partners.org. Unknown parameter
|lang=ignored (help) - Mark Wade. "UR-100". Astronautix.com. Unknown parameter
|lang=ignored (help) - Mark Wade. "UR-200". Astronautix.com. Unknown parameter
|lang=ignored (help) - Mark Wade. "Proton". Astronautix.com. Unknown parameter
|lang=ignored (help) - Mark Wade. "UR-700". Astronautix.com. Unknown parameter
|lang=ignored (help) - Mark Wade. "UR-700M". Astronautix.com. Unknown parameter
|lang=ignored (help) - Mark Wade. "UR-900". Astronautix.com. Unknown parameter
|lang=ignored (help)
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