Timeline for all types of items produced by
PDI [Program Design, Inc.]

Year	Items
1978	9
1980	3
1981	3
1982	1
1983	2
1984	1

19 items with a valid date were considered for this timeline (95.00% of the total)
1 item with an invalid date.

Help us in our quest to find exact dates for:

19??: 1 item.