diff --git a/index.html b/index.html
index a96063c..996fc7c 100644
--- a/index.html
+++ b/index.html
@@ -46,7 +46,6 @@ <h2>Introduction to Programming</h2>
     <li><b><a style="text-decoration:none" href="https://allendowney.github.io/ThinkPython/" target="_blank">Think Python - How to think like a Computer Scientist</a></b></li>
     <li><b><a style="text-decoration:none" href="https://lambertk.academic.wlu.edu/breezypythongui/" target="_blank">Breezy Python UI</a></b></li>
     <li><a style="text-decoration:none" href="https://mcsp.wartburg.edu/zelle/python/" target="_blank">Python Programming: An Introduction to Computer Science</a></li>
-    <li><a style="text-decoration:none" href="https://ehmatthes.github.io/pcc_3e/" target="_blank">Python Crash Course</a></li>
   </ul>
   <br>
   <hr>
@@ -57,7 +56,6 @@ <h2>Introduction to Analytics and Data Science</h2>
     <li><b><a style="text-decoration:none" href="https://github.com/guttag/Intro-to-Computation-and-Programming" target="_blank">Introduction to Computational Thinking and Data Science</a></b></li>    
     <li><b><a style="text-decoration:none" href="https://farid.berkeley.edu/downloads/tutorials/learnPython/" target="_blank">Introduction to Data Structures and Analytics</a></b></li>    
     <li><a style="text-decoration:none" href="https://www.amazon.com.au/Introduction-Computation-Programming-Using-Python/dp/0262542366/" target="_blank">Introduction to Computation and Programming Using Python</a></li>
-    <li><a style="text-decoration:none" href="https://www.amazon.com.au/dp/1292023589/" target="_blank">Numerical Analysis</a></li>
   </ul>
   <br>
   <hr>
@@ -69,6 +67,7 @@ <h2>Mathematics for Computer Science</h2>
     <li><a style="text-decoration:none" href="https://www.bloomsbury.com/au/discrete-mathematics-for-computing-9780230216112/" target="_blank">Discrete Mathematics for Computing</a></li>
     <li><a style="text-decoration:none" href="https://www.amazon.com.au/dp/1292146656/" target="_blank">Engineering Mathematics</a></li>
     <li><a style="text-decoration:none" href="https://www.amazon.com.au/dp/1292161361/" target="_blank">Probability & Statistics for Engineers & Scientists</a></li>
+    <li><a style="text-decoration:none" href="https://www.amazon.com.au/dp/1292023589/" target="_blank">Numerical Analysis</a></li>
   </ul>
   <br>
   <hr>