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511. Letter from Daniel M. Singer to Paul Berg

512. Letter from Daniel M. Singer to Paul Berg

514. Lab notes on initial cell culture work

515. Lab notes on polyoma virus assay

516. Lab notes on second experiment with Py-6

517. Letter from Paul Berg to Francis Crick

518. Lab notes on polyoma plaque assay

519. Lab notes on assay of RNA-P preps

520. Letter from Paul Berg to Fred H. Bergmann