TY - RPRT TI - Palynostratigraphy of Cretaceous and Quaternary strata in the Robins Point corehole, Aberdeen Proving Ground, Harford County, Maryland AU - Norman O. Frederiksen AU - David S. Powars AU - Alan P. Hoffmeister AU - Thomas P. Sheehan PY - 1997 DO - 10.3133/ofr97279 UR - https://pubs.usgs.gov/publication/ofr97279 ID - ofr97279 ER -