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1. The first catalogue of the Library of the Surgeon General's Office, Washington, 1840: facsimile copy of the original manuscript published to mark the 125th anniversary of the founding of the National Library of Medicine

4. Prospect sources

14. United States Army veterinary service in World War II

15. Letter from Paul Berg to Fred H. Bergmann

16. Letter from Paul Berg to Hans G. Boman

18. Letter from Theodore R. Breitman to Paul Berg

21. Letter from Paul Berg to Alfred Tissieres

27. Letter from Francis Crick to Fritz Lipmann

29. DNA

30. The Molecular Structure of Polyadenylic Acid

31. The Theory of Mutagenesis [Editorial letter]

32. General Nature of the Genetic Code for Proteins

33. Letter from Francis Crick to Jacques Monod

38. Lab notes on Morton DNA

42. Biochemistry 101 exam

43. Letter from Salvador E. Luria to Jacques Monod

54. Letter from Samuel H. Boyer to Victor A. McKusick

56. Profiles in Science: Linus Pauling

58. Letter from H. Gobind Khorana to Maxine Singer

66. Letter from Joshua Lederberg to George W. Beadle

67. Letter from George W. Beadle to Joshua Lederberg

72. Letter from Joseph Tomcsik to Joshua Lederberg

73. Letter from Joshua Lederberg to Joseph Tomcsik

74. Letter from John J. Trentin to Joshua Lederberg

77. Letter from Joshua Lederberg to Harold C. Urey

78. Letter from Harold C. Urey to Joshua Lederberg

79. Letter from Wolf Vishniac to Joshua Lederberg

83. Letter from Hideo Kikkawa to Joshua Lederberg

84. Letter from Yukinori Hirota to Ida Orskov

85. Letter from Ida Orskov to Yukinori Hirota

86. Letter from Joshua Lederberg to Yukinori Hirota

87. Letter from Yukinori Hirota to Ida Orskov

88. Letter from Yukinori Hirota to Joshua Lederberg

89. Letter from Joshua Lederberg to Yukinori Hirota

93. Letter from Joshua Lederberg to John F. Kennedy

94. Letter from John F. Kennedy to Joshua Lederberg

95. Letter from Joshua Lederberg to Sydney Brenner

96. Letter from Joel L. Brenner to Joshua Lederberg

97. Letter from Joshua Lederberg to Joel L. Brenner

98. Letter from Joel L. Brenner to Joshua Lederberg

99. Letter from Joel L. Brenner to Joshua Lederberg

100. Letter from Jean H. Breig to Joshua Lederberg