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1142. Letter from Paul Berg to Daniel M. Singer

1143. Letter from Daniel M. Singer to Paul Berg

1144. Letter from Daniel M. Singer to Paul Berg

1146. Lab notes on initial cell culture work

1147. Lab notes on polyoma virus assay

1148. Lab notes on second experiment with Py-6

1149. Letter from Paul Berg to Francis Crick

1150. Lab notes on polyoma plaque assay