Photocopies of ten signed handwritten and typed letters in French, with transcripts, from Pierre Teilhard to André Ravier from October 19, 1951 to September 24, 1953.
Photocopies of eleven signed handwritten and typed letters in French, with transcripts, from Pierre Teilhard to André Ravier from April 27, 1954 to March 23, 1955.
Materials regarding Pierre Teilhard de Chardin organized chronologically as they were received by Bronwen Astor.