Blueprint Resources Books and Studies NASA 1986 “The Case for Mars” proposal Dr. Zubrin 1991 “Mars Direct” proposal Dr. Zubrin 2021 “The Case for Mars” Book National Space Society Roadmap to Space Settlement Ways to get involved National Space Society The Mars Society Join the Conversation! The Mars Society Facebook Mars Society Reddit Mars Reddit National Space Society Social Media Tools and Calculators Artificial Gravity Spin Calculator Info Sites Marspedia