Traffic engineering

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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42 (1972)	?	?	?	?	?	?	?	1	1	?	?	?
43 (1972)	1	?	?	?	?	?	?	?	?	?	?	?
43 (1973)	?	?	?	2	?	?	?	2	?	?	1	?
44 (1973)	?	1	?	?	?	?	?	?	?	?	?	?
44 (1974)	?	?	?	?	?	2	?	?	?	2	?	1
45 (1975)	1	?	2	?	?	?	?	2	?	?	?	?
46 (1976)	1	?	2	?	?	?	3	1	2	?	?	?
47 (1977)	2	1	1	?	1	?	?	?	?	?	?	?