Discourse processes

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

	1	2	3	7

21 (1996)	?	1	?	?
38 (2004)	1	?	?	?
43 (2007)	?	?	1	?
50 (2013)	?	?	?	1