TY  - RPRT
TI  - Automated /unmanned/ Mars sample return missions.
AU  - Dockery, J. T.
AU  - Niehoff, J. C.
AU  - Roberts, D. L.
PY  - 1967
UR  - https://ntrs.nasa.gov/citations/19680030870
ID  - 19680030870
ER  -