Use these options to specify how the date range returns results. " Exact" means that the start and end dates of descriptions returned must fall entirely within the date range entered. " Overlapping" means that any description whose start or end dates touch or overlap the target date range will be returned. 

Image of carving by Bill Reid, 7waasru (Wasgo).  The carving was commissioned by the University of British Columbia for display in Totem Park, originally.  The sculpture was moved to the Museum of Anthropology in 1978.