diff --git a/pdf/build_book.bat b/pdf/build_book.bat
index 0e189e9..0c6ee1c 100644
--- a/pdf/build_book.bat
+++ b/pdf/build_book.bat
@@ -1,7 +1,6 @@
-
-python merge_book.py >Kalman_and_Bayesian_Filters_in_Python.ipynb
-
-
-ipython nbconvert --to pdf --template book Kalman_and_Bayesian_Filters_in_Python.ipynb
+python merge_book.py
+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/clean_book.bat b/pdf/clean_book.bat
index c0dcd8c..3d6fdf8 100644
--- a/pdf/clean_book.bat
+++ b/pdf/clean_book.bat
@@ -1,14 +1,12 @@
-#! /bin/bash
+REM WINDOWS script to delete all files
+
 rm --f *.tex
 rm --f *.toc
-rm --f ./*_files/*.png
-rm --f Kalman_and_Bayesian_Filters_in_Python.ipynb
-rm --f Kalman_and_Bayesian_Filters_in_Python.toc
-rm --f Kalman_and_Bayesian_Filters_in_Python.tex
-rmdir  ./*_files/ 2> /dev/null
+rm --f *.aux
+rm --f *.log
+rm --f *.out
 
-if (( $# == 1)); then
-  if [ "@1" == all ]; then
-    rm Kalman_and_Bayesian_Filters_in_Python.pdf;
-  fi 
-fi
+rm --f book.ipynb
+rm --f book.toc
+rm --f book.tex
+rmdir  /S /Q book_files
diff --git a/pdf/merge_book.py b/pdf/merge_book.py
index 3e501e1..b6d68c3 100644
--- a/pdf/merge_book.py
+++ b/pdf/merge_book.py
@@ -5,7 +5,7 @@ import sys
 from formatting import *
 
 
-def merge_notebooks(filenames):
+def merge_notebooks(outfile, filenames):
     merged = None
     added_appendix = False
     for fname in filenames:
@@ -23,16 +23,17 @@ def merge_notebooks(filenames):
             merged.cells.extend(nb.cells)
     #merged.metadata.name += "_merged"
 
-    print(nbformat.writes(merged, nbformat.NO_CONVERT))
+    outfile.write(nbformat.writes(merged, nbformat.NO_CONVERT))
 
 
 if __name__ == '__main__':
+    f = open('book.ipynb', 'w', encoding='utf-8')
     '''merge_notebooks(
         ['../00_Preface.ipynb',
          '../01_g-h_filter.ipynb',
          '../Appendix_A_Installation.ipynb'])'''
 
-    merge_notebooks(
+    merge_notebooks(f,
         ['../00_Preface.ipynb',
          '../01_g-h_filter.ipynb',
          '../02_Discrete_Bayes.ipynb',
diff --git a/pdf/to_pdf.py b/pdf/to_pdf.py
index 90795d8..96ce330 100644
--- a/pdf/to_pdf.py
+++ b/pdf/to_pdf.py
@@ -4,10 +4,11 @@ import io
 import IPython.nbconvert.exporters.pdf as pdf
 import fileinput
 
-for line in fileinput.input('Kalman_and_Bayesian_Filters_in_Python.tex', inplace=True):
-    print(line.replace('\chapter{Preface}', '\chapter*{Preface}'), end='')
+for line in fileinput.input('book.tex', openhook=fileinput.hook_encoded("iso-8859-1")):
+#    print(line.replace('\chapter{Preface}', '\chapter*{Preface}'), end='')
+    line.replace('\chapter{Preface}', '\chapter*{Preface}')
 
 
 p = pdf.PDFExporter()
-p.run_latex('Kalman_and_Bayesian_Filters_in_Python.tex')
+p.run_latex('book.tex')