Houts - Nuclear Propulsion for Space Applications - New paperback or s - X555z

Morcan - ANTIGRAVITY PROPULSION Human or Alien Technologies - New pa - X555z

Williams - Aliens and Space Exploration For Beginners - New paperback - X555z

Jacobson - Vision for Space Exploration - New paperback or softback - X555z

Sun - Non-Propellant Propulsion for Space Flight - New paperback or so - X555z

Solid Rocket Propulsion for Space Exploration by Dr Gurunadh Velidi (English) Pa

NASA Technical Repor - Propulsion for Deep Space - New paperback or so - X555z

Buden - Nuclear Thermal Propulsion Systems - New paperback or softback - X555z