The collection consists of (a) approximately 50 field notebooks from geologic mapping, including field maps showing outcrop locations corresponding to the field notes and in some cases draft copies of quadrangle geologic maps, (b) approximately 20 notebooks and associated sample location maps from the Chesapeake Bay Earth Science Study (CBESS), and (c) 1 notebook from the Hart-Miller Island Monitoring Study. Some notes are in pencil and may be difficult to read.