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+## 2020-08-31
+
+How big of a difference in preservation coverage stats does the inclusion of
+PKP PLN numbers result in?
+
+ select count(*), sum(journal.release_count), sum(journal.preserved_count) from journal join directory on journal.issnl = directory.issnl where directory.slug = 'pkp_pln';
+
+ count(*) sum(journal.release_count) sum(journal.preserved_count)
+ ---------- -------------------------- ----------------------------
+ 1356 343333 283984
+
+So about 60k releases.
+
## 2020-06-23
Where do back ISSN-Ls come from? Answer: exiting fatcat metadata.