TY  - BOOK
AU  - Shipman,Harry L.
TI  - Humans in space: 21st century frontiers 
SN  - 0306431718 
PY  - 1989///
CY  - New York
PB  - Plenum Press
KW  - Astronautics
KW  - Outer space
KW  - Exploration
ER  -