For a journal which is published periodically (e.g. monthly) what is the world for a specific period's published version? For example, "The past ten _____'s of Nature have each contained an article on colloid synthesis." Maybe "release," "edition," or "publication?" None of those seem quite right: I associate "release" with something more like a press, movie, or album release, "edition" with a variant of the method of publication or a book with relatively minor revisions from the previous edition (as opposed to a journal, which has completely new content every time), and "publication" with a specific article within the journal. A specific release of an academic journal is usually indicated by the journal number (e.g. "Nature 5, [page] 514 (1983)"), but it sounds funny to describe a specific release as a "number."
The word you want is issue. Academic journals publish issues that are organized by volume number and issue number. Scholarly citations note both volume and issue along with page numbers and date.
The April 2016 issue of Psychoanalytic Quarterly (Volume 85, Issue 2, Pages 269–561) focuses on a special topic, "Is Truth Relevant?".