Correspondence, notes, and field notebooks related to Holmes' collection of diatoms collected from Dall's porpoises from 1982-1985.

Robert W. Holmes was born in Dover, NH, in 1925. He began his diatom career at the age of twelve by looking at diatoms and algae in a little pond located on the Haverford College campus, where his father was a professor.

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Collection is open for research.