The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
The paper's own reprint header gives the issue and no day: "Reprinted with corrections from The Bell System Technical Journal, Vol. 27, pp. 379-423, 623-656, July, October, 1948." It ran in two parts, July and October; a month with no day is estimated at that month's last day, so the pin sits at the end of July 1948, the first part.
Gives the journal and year and the paper's standing: "one of the most influential and cited scientific papers of all time, as it gave rise to the field of information theory", and the 1949 book retitling from A to The Mathematical Theory of Communication.[1]
The author's article, for his position at Bell Labs and his earlier 1937 master's thesis applying Boolean algebra to switching circuits.[1]
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