[Liberty Valance]

http://www.sciencedaily.com/releases/2009/07/090717150254.htm
Apollo 11 Moon Rocks Still Crucial 40 Years Later, Say Researchers

[xp38]

Of the 6 Apollo missions that landed on the moon Apollo 11 spent the least time and collected the least amount of lunar material. Each subsequent one I think spent more time on the moon and collected more so Apollo 17 rocks should be the most numerous.