TEMPORAL COVERAGE OF TYPE “images” IN THE ADL CATALOG

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There are 1,776,505 time intervals associated with items of type “images” in the ADL Catalog as of March 5, 2000. The number of time intervals may differ from the number of items because each item in the collection can have zero, one, or more than one associated time interval. Typically, items have one associated time interval.

The temporal coverage of the time intervals is graphically shown by the histogram below. Each red spike represents a year; each green/yellow bar, a decade. The height of a spike or bar reflects the number of time intervals that overlap that time period.

The following table shows the temporal coverage numerically. The cells in the “Overall” column represent decades; the cells to the right of a decade represent individual years within that decade. The value in a cell is the number of time intervals that overlap the decade or year represented by that cell.

		Overall	Year in decade
			0	1	2	3	4	5	6	7	8	9
Decade	1970s	1424805	0	637	83836	537150	159197	68557	212759	219687	117133	25849
	1980s	194302	21727	16495	20237	25699	17994	23791	8501	12048	26832	20978
	1990s	157398	22677	26873	21906	14130	19501	26723	13943	11645	0	0