--- PresentationSlides v2
+++ PresentationSlides v3
@@ -1,3 +1,3 @@
* [talk:2017] - [http://feather.perl6.nl/~util/YAPC_2009_commandline_perl/|HTML .zip and .tar]
- * [talk:2000] - [https://www.pgexperts.com/document.html?id=29|PDF]
+ * [talk:2000] - [http://www.pgexperts.com/document.html?id=29|PDF]