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Articles in SafetyLit
Y-Axis = Volume :: X-Axis = Issue
?=unknown status :: X=no issue published :: nn=articles from issue :: A=relevant article(s) IDed to add
S=searched, nothing relevant :: O=issue published but not yet searched :: C=combination issue

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17 (1986)	?	1	?	?
18 (1987)	1	?	?	?
20 (1989)	1	?	?	?
23 (1992)	?	?	?	1
26 (1995)	?	?	1	?
28 (1997)	?	?	?	1