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May 1
  • AHP writes cheque to: Commercial Credit Company amount $23.30 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Connecticut Mutual Life Insurance Co. amount $11.55 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Connecticut Mutual Life Insurance Co. amount $9.42 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Dr. E. H. McMillan amount $5 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Dr. Herbert A. Whipple amount $3 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Encyclopedia Britannica, Inc. amount $16.30 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: The May Company amount $16.49 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: William D. Crane amount $100 [Filed under LP Biographical: Box #4.011, Folder #2]
  • LP writes cheque to: Cash amount $25 [Filed under LP Biographical: Box #4.011, Folder #2]

May 4
  • AHP writes cheque to: Faculty Club, U of C amount $44.81 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Pashgian Brothers amount $50 [Filed under LP Biographical: Box #4.011, Folder #2]
  • LP writes cheque to: Cash amount $25 [Filed under LP Biographical: Box #4.011, Folder #2]
  • Letter from M. Gomberg, University of Michigan, to LP RE: Thanks LP for bearing them in mind concerning a modern physical chemist but they will not have a vacancy nexty ear since the Legislature is considering cutting down the income of the University. [Filed under LP Personal Safe: Drawer 3, Folder 3.018.84]

May 5
  • AHP writes cheque to: A. C. Vroman Inc. amount $4.60 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Athenaeum amount $1.16 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Barker Brothers, Inc. amount $46 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: City Assessor amount $4.41 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: City of Pasadena amount $3.46 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: City of Pasadena amount $4.65 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: County Assessor amount $7.44 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Los Angeles Gas and Electric Corporation amount $3.63 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Mrs. M. M. Fillmore amount $10.80 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Pasadena Star News amount $1.30 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Southern California Telephone Co. amount $3.05 [Filed under LP Biographical: Box #4.011, Folder #2]

May 6
  • AHP writes cheque to: C. G. Pidgeon amount $24.75 [Filed under LP Biographical: Box #4.011, Folder #2]

May 7
  • AHP writes cheque to: Athenaeum amount $2 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: M. H. Haskett amount $5 [Filed under LP Biographical: Box #4.011, Folder #2]

May 8
  • AHP writes cheque to: Bullocks amount $13.60 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Mrs. Jeanne Goudsmit amount $2 [Filed under LP Biographical: Box #4.011, Folder #2]

May 9
  • AHP writes cheque to: Mrs. M. M. Fillmore amount $15.90 [Filed under LP Biographical: Box #4.011, Folder #2]

May 12
  • Letter from J.W. McBain, Stanford University, to LP, RE: Says that they are disappointed that they couldn't secure LP a position at Stanford, but that it is possible that LP could pay them an annual visit to give a series of lectures or seminars for graduate students. Explains that he wants to bind more closely the 3 California Institutions. Handwritten note by LP: "Much pleased. Can't make the annual arrangement. Could probably come 1 or 2 months next spring. Prob. depend on new Prof of p.ch. Estimates $800 1 mo., 1500 for 2. Nature of ch. bond." [Filed under LP Personal Safe: Drawer 2, Folder 2.003.31]
  • Letter from Vice President, McGraw Hill Book Company, Inc. to LP RE: Reports that the London office has sold 165 copies of Structure of Line Spectra in the period ending April 1st. This is a very impressive record as compared with the average distribution of American books through the English branch. [Filed under: LP Books, 1930b.5]

May 15
  • AHP writes cheque to: Sanitary Laundry amount $3.11 [Filed under LP Biographical: Box #4.011, Folder #2]

May 17
  • AHP writes cheque to: Golden State Company, Ltd. amount $8.14 [Filed under LP Biographical: Box #4.011, Folder #2]

May 20
  • AHP writes cheque to: Mrs. M. M. Fillmore amount $10 [Filed under LP Biographical: Box #4.011, Folder #2]
  • Letter from LP to Sam Goudsmit. RE: Advises him to leave the physics papers on Saturday afternoon. Informs him to get off the train at Glendall. [Filed under LP Correspondence: G: Individual Correspondence, Box #137.4]

May 24
  • AHP writes cheque to: Mary Emerson amount $3.85 [Filed under LP Biographical: Box #4.011, Folder #2]

May 26
  • AHP writes cheque to: Hertel's amount $1 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Martin Casey amount $3.25 [Filed under LP Biographical: Box #4.011, Folder #2]
  • Letter from LP to Sam Goudsmit. RE:
  • Letter from LP to Sam Goudsmit. RE: Gives him advice about sightseeing in California. Informs him of a bad car accident. Has found more mistakes in the book. [Filed under LP Correspondence: G: Individual Correspondence, Box #137.4]
  • Letter from Wendell M. Latimer, University of California, to LP RE: Thanks LP for the powd3er photographs of the TlNO3. Appreciates all the time and effort LP and Dr. Sturdivant spent on this problem. [Filed under LP Personal Safe: Drawer 3, Folder 3.018.126]

May 27
  • AHP writes cheque to: Mrs. M. M. Fillmore amount $10 [Filed under LP Biographical: Box #4.011, Folder #2]

May 29
  • LP writes cheque to: Pashgian Bros. amount $50 [Filed under LP Biographical: Box #4.011, Folder #2]

May 30
  • AHP writes cheque to: Sanitary Laundry amount $2.72 [Filed under LP Biographical: Box #4.011, Folder #2]