Composition of Apollo 16 fines 60051, 60052, 64811, 64812, 67711 67712, 68821, and 68822 Simkin, T. ; Noonan, A. F. ; Switzer, G. S. ; Mason, B. ; Nelen, J. A. ; Melson, W. G. ; Thompson, G. Abstract Publication: Lunar and Planetary Science Conference Proceedings Pub Date: 1973 Bibcode: 1973LPSC....4..279S