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61. Letter from Paul Berg to Francis Crick

62. Lab notes on polyoma plaque assay

63. Lab notes on assay of RNA-P preps

64. Letter from Paul Berg to Fred H. Bergmann

65. Letter from Paul Berg to Hans G. Boman

67. Letter from Theodore R. Breitman to Paul Berg

69. Letter from Paul Berg to Francis Crick

70. Letter from Francis Crick to Paul Berg