Photocopies of one signed typed letter and one signed handwritten letter in English, from Pierre Teilhard to Olga Hempel-Gowen dated March 28, 1934, and Mrs Hempel-Gowen's response dated November 8, 1934.
Photocopy of one signed typed letter in English, from Pierre Teilhard to Mr. Bradfield dated March 21, 1934 notifying Bradfield of Mrs. Hempel-Gowen's responsibility for the Cenozoic Research Laboratory in Teilhard's absence.