1. The anthropology of astronautics;Ehricke;Astronautics,1957
2. Lunar industries and their value for the human environment on Earth. 23rd Int. Astronautical Congress, Vienna;Ehricke;Acta Astronautica,1972
3. Socio-economic determinants of a program for lunar industrialization in support of space light development Lunetta and Soletta;Ehricke,1977