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2 talks found:

(Click on mtg# for details and minutes)

Rec Mtg# Year Authors Institution Talk title
1 1196 1990 Peter J. Heaney National Museum of Natural History The many faces of quartz: a TEM study of agates
2 1387 2005 Peter J. Heaney Pennsylvania State University Tiger’s-eye and pietersite: fraternal gems with disparate ancestries