Groot, J.J.2009-04-022009-04-021988-06http://udspace.udel.edu/handle/19716/4146Emphasis is placed herein on the years of Dr. Groot's leadership of the Survey. The remarkable work of James C. Booth in the last century is acknowledged but has elsewhere been entered in history. Some continuing activities of the Survey after 1969 are noted together with comments of an experienced observer; this current period may someday receive the attention of a recorder having the enhanced perspective of time.enGrootDelaware Geological SurveyTechnical Report