TY  - RPRT
TI  - Rare earths, other trace elements and iron in Luna 20 samples.
AU  - Helmke, P. A.
AU  - Blanchard, D. P.
AU  - Jacobs, J. W.
AU  - Haskin, L.
AU  - Haskin, A.
PY  - 1973
UR  - https://ntrs.nasa.gov/citations/19730043515
ID  - 19730043515
ER  -