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diff --git a/docs/TR-20210808100000-IA-WDS-REFCAT/refs_types.dot b/docs/TR-20210808100000-IA-WDS-REFCAT/refs_types.dot
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+// dot -Tpng refs_types.dot > refs_types.png
+digraph {
+  Papers[label="Papers\n(fatcat; incl. datasets)",shape=rect]
+  Books[label="Books\n(openlibrary)",shape=rect]
+  Encyclopedia[label="Encyclopedia\n(wikipedia)",shape=rect]
+  Web[label="Web\n(wayback)",shape=rect]
+  // OtherMedia[label="Other Media? TODO\n(archive.org)", color=orange]
+  Unmatched[label="Unknown/Unmatched", color=grey]
+  Papers -> Papers[color=green,label="1.3 billion",penwidth=2]
+  Papers -> Unmatched[color=orange,label="0.7 billion",penwidth=2]
+  Papers -> Books[color=green,label="20 million"]
+  Papers -> Web[color=orange,label="WIP / 25 million"]
+  Books -> Papers[color=red]
+  Books -> Web[color=red]
+  Books -> Books[color=red]
+  Encyclopedia -> Papers[color=green,label="1.3 million"]
+  Encyclopedia -> Books[color=gray,label="TODO"]
+}