TY  - RPRT
TI  - Space and earth sciences. The big view.
AU  - R W Porter
PY  - 1971
DO  - 10.1111/j.1749-6632.1971.tb41303.x
UR  - https://pubmed.ncbi.nlm.nih.gov/5286642/
ID  - 5286642
ER  -