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-rw-r--r--python/notes/version_3.md6
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diff --git a/python/notes/version_3.md b/python/notes/version_3.md
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@@ -302,3 +302,9 @@ So maybe 500k isbn in total?
* need to find them, then validate them
+----
+
+## Notes on URLList
+
+* about 25M urls
+* about 11075871 seem to have a "doi"