Rare-earth elements in Apollo 12 lunar materials
Apollo 12 lunar rock rare earth element abundances, comparing to Icelandic basalt flow
Allen, R. O.↗
Engineering topics
Zweifel, K. A.
Publications and source records attributed to Zweifel, K. A..
Rare earths and other trace elements in Apollo 11 lunar samples
Rare earth and trace element abundances for Apollo 11 lunar samples by neutron activation, comparing with Bruderheim chondrite and submarine basalts
Allen, R. O.↗