Second opinion

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

		2	3	4	15

(1990)	?	?	?	?	1
15 (1990)	1	?	?	?	?
17 (1992)	?	?	1	?	?
18 (1993)	?	?	?	1	?
20 (1994)	?	1	?	?	?