1. Inquiry into the Feasibility of Weather Reconnaissance from a Satellite Vehicle;Greenfield,1951
2. Studies of a Minimum Orbital Unmanned Satellite of the Earth (MOUSE);Singer;Astronautica Acta,1955
3. Use of an Artificial Satellite in Upper Air Research;Kallmann;Bul. Amer. Met. Soc.,1957
4. Major Problems in Atmospheric Radiation: An Evaluation and Recommendations for Future Efforts;Bul. Amer. Met. Soc.,1972