diff --git a/pdf/build_book.bat b/pdf/build_book.bat
index f07e28d..65952c5 100644
--- a/pdf/build_book.bat
+++ b/pdf/build_book.bat
@@ -1,9 +1,5 @@
 python merge_book.py
 
-ipython nbconvert --to latex --template book6x9 book.ipynb
-ipython to_pdf.py
-move /Y book.pdf ../Kalman_and_Bayesian_Filters_in_Python6x9.pdf
-
 ipython nbconvert --to latex --template book book.ipynb
 ipython to_pdf.py
 move /Y book.pdf ../Kalman_and_Bayesian_Filters_in_Python.pdf
diff --git a/pdf/build_book6x9.bat b/pdf/build_book6x9.bat
new file mode 100644
index 0000000..48a6a9b
--- /dev/null
+++ b/pdf/build_book6x9.bat
@@ -0,0 +1,4 @@
+ipython nbconvert --to latex --template book6x9 book.ipynb
+ipython to_pdf.py
+move /Y book.pdf ../Kalman_and_Bayesian_Filters_in_Python6x9.pdf
+
diff --git a/pdf/merge_book.py b/pdf/merge_book.py
index 025e5af..f194c05 100644
--- a/pdf/merge_book.py
+++ b/pdf/merge_book.py
@@ -49,6 +49,6 @@ if __name__ == '__main__':
          '../14-Adaptive-Filtering.ipynb',
          '../Appendix-A-Installation.ipynb',
          '../Appendix-B-Symbols-and-Notations.ipynb',
-         '../Appendix-C-Walking-Through-KF-Code.ipynb',
+         #'../Appendix-C-Walking-Through-KF-Code.ipynb',
          '../Appendix-D-HInfinity-Filters.ipynb',
          '../Appendix-E-Ensemble-Kalman-Filters.ipynb'])