1. Bedrock geologic map of the Hubbard Brook Experimental Forest, Grafton County, New Hampshire [computer file] Yale Public content 2000. 2002-06-01T04:00:00Z. 2023-02-11T04:46:17Z. Burton, William C. (William Chapin), 1952-. The Survey. English. Public. Hubbard Brook Experimental Forest (N.H.), New Hampshire, and Hubbard Brook Experimental Forest.