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• LP Research Notebooks, RNB 06 RE: Epidote (while in Manchester)
• Manuscript Notes: "The Hyperfine Structure of Spectral Lines", Manchester, England, May-June, 1930 [LP Science Box 5.001, Folder 5]

• Letter from D.L. Webster, Executive Head of the Department of Physics at Stanford University, to LP, RE: Asks if LP would accept appointment as Acting Associate Professor of Physics at Stanford for the Winter Quarter of 1931 at a stipend of $1500. Discusses the lectures that they would like LP to give. Handwritten reply by LP on back indicating that he can't accept the appointment. [Filed under LP Personal Safe: Drawer 2, Folder 2.005.27]

• Letter from W.L. Bragg, the Physical Laboratories of the University of Manchester, to LP, RE: Apologizes for not being able to welcome LP personally, because he has to go to Cambridge for a meeting on the weekend LP arrives. Provides LP with the details concerning the house he will be staying at in Didsbury. [Filed under LP Personal Safe: Drawer 3, Folder 3.018.14]

• Manuscript Notes: "Compact Tetrahedral Structures", Manchester, England [LP Science Box 5.001, Folder 3]

• AHP writes cheque to: The Faculty Club amount $2.55 [Filed under LP Biographical: Box #4.011, Folder #1]
• Letter from W.F. Giauque, Department of Chemistry at the University of California, to LP, RE: Informs LP that he recently rechecked his calculations on Simon, Mendelssohn, and Ruhemann's hydrogen heat capacity data and that the entropy of transition down to 2 degrees K is about 0.45 E.U. instead of 1.8 E.U. [Filed under LP Personal Safe: Drawer 3, Folder 3.018.83]

• Manuscript Notes: "The Motion of the Electron in the Hydrogen Molecule-ion, and Similar Problems", Manchester, England [LP Science Box 5.001, Folder 4]

• Letter from Robert A. Millikan to LP, RE: Informs LP that the Executive Council fixed his salary at $7,000 a year. Handwritten note by LP at bottom indicates that he replied on June 15th. Handwritten calculations in top left corner. [Filed under LP Personal Safe: Drawer 2, Folder 2.005.34]

• Letter from Arthur A. Noyes to LP, RE: Informs him that the Executive Council voted to increase his salary from $5000 to $7000 beginning September 1, 1930. [Filed under LP Personal Safe: Drawer 2, Folder 2.005.10]

• Letter from A. Sommerfield to LP RE: Written in German. Unable to translate. [Filed under LP Personal Safe: Drawer 3, Folder 3.018.191]