- Letter from S.S. Bhatnagar, Ministry of Natural Resources and Scientific Research to LP RE: requests LP's itinerary for his upcoming trip to India. Handwritten note: "I hope you remember our meeting in Pasadena in 1944". [Reply from LP to Bhatnagar October 6, 1953].
- Research Note Books of LP, RNB 14 RE: notes on collagen and the configuration of Polypeptide chains. Notes the Pasadena conference on the configuration of polypeptide chains. Notes comments made by some of the participants of the conference. Goes on to record some more notes on the different helix structures. [p. 27] [previous notes September 20, 1953, further notes September 27, 1953].