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diff --git a/extra/wikipedia/stats_enwiki_20210801.txt b/extra/wikipedia/stats_enwiki_20210801.txt
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+
+export CITEFILE=enwiki-20210801-pages-articles.citations.json.gz
+
+# total number of articles processed
+zcat $CITEFILE | wc -l
+=> 6,348,910
+
+# articles with one or more refs
+zcat $CITEFILE | rg '"CitationClass"' | wc -l
+=> 4,255,940
+
+# total number of refs
+zcat $CITEFILE | jq '.refs[].CitationClass' -r | wc -l
+=> 36,057,931
+
+# refs by type
+zcat $CITEFILE | jq '.refs[].CitationClass' -r | sort | uniq -c | sort -nr
+ 21257548 web
+  6162933 news
+  3984831 book
+  2620278 journal
+   756082 citation
+   379975 harvnb
+   105212 gazette
+    99427 pressrelease
+    84036 nhle
+    78761 encyclopedia
+    71774 gnis
+    70308 nrisref
+    67731 report
+    48090 episode
+    43060 geonet3
+    41776 map
+    40904 AV-media-notes
+    40140 season
+    28051 AV-media
+    22182 thesis
+    17891 conference
+    10420 england
+     7798 interview
+     5100 sports-reference
+     3332 podcast
+     2557 arxiv
+     1859 techreport
+     1455 mailinglist
+     1284 speech
+      860 newsgroup
+      837 sign
+      657 serial
+      567 DVD-notes
+      215 policy
+
+# identifiers present
+zcat $CITEFILE | jq '.refs[] | select(.ID_list != null) | .ID_list | keys[]' -r | sort | uniq -c | sort -nr
+ 2825707 ISBN
+ 1859682 DOI
+  980996 PMID
+  520281 ISSN
+  342543 PMC
+  294828 BIBCODE
+  261269 OCLC
+  157287 JSTOR
+   82960 ARXIV
+   23376 MR
+   20723 LCCN
+    9518 ASIN
+    7520 OL
+    4845 ZBL
+    4447 SSRN
+     954 OSTI
+     666 JFM
+     425 USENETID
+     151 ISMN
+      95 RFC
+
+# refs with URL, by type
+zcat $CITEFILE | jq '.refs[] | select(.URL != null) | .CitationClass' -r | sort | uniq -c | sort -nr
+ 21169067 web
+  5743802 news
+  1958773 book
+  1165475 journal
+   476587 citation
+    98280 pressrelease
+    62235 report
+    60868 encyclopedia
+    27680 map
+    18742 AV-media
+    15317 thesis
+    11236 conference
+    10666 episode
+     6609 interview
+     5100 sports-reference
+     3328 podcast
+     2431 AV-media-notes
+     1446 mailinglist
+     1361 techreport
+     1039 speech
+      821 newsgroup
+      504 sign
+      138 serial
+       24 harvnb
+       21 DVD-notes
+       15 gazette
+        2 gnis