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2 talks found:

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Rec Mtg# Year Authors Institution Talk title
1 261 1912 Claude Ellsworth Siebenthal USGS The Joplin lead and the zinc deposits
2 368 1922 Claude Ellsworth Siebenthal USGS Fluorspar district of Jardin County, Illinois
Claude Ellsworth Siebenthal was Chair of the Auditing Committee in 1907
Claude Ellsworth Siebenthal was on the Council in 1908
Claude Ellsworth Siebenthal was on the Council in 1912
Claude Ellsworth Siebenthal was on the Council in 1913
Claude Ellsworth Siebenthal was Chair of the Program Committee in 1913