diff --git a/00_Preface.ipynb b/00_Preface.ipynb
index 58c9ac2..8be43e0 100644
--- a/00_Preface.ipynb
+++ b/00_Preface.ipynb
@@ -14,6 +14,13 @@
     "# Preface"
    ]
   },
+  {
+   "cell_type": "raw",
+   "metadata": {},
+   "source": [
+    "\\addcontentsline{toc}{chapter}{Preface}"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 1,
diff --git a/Appendix_A_Installation.ipynb b/Appendix_A_Installation.ipynb
index 3bd7845..0e5daf5 100644
--- a/Appendix_A_Installation.ipynb
+++ b/Appendix_A_Installation.ipynb
@@ -8,27 +8,11 @@
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": 1,
+   "cell_type": "raw",
    "metadata": {
     "collapsed": false
    },
-   "outputs": [
-    {
-     "data": {
-      "text/latex": [
-       "\\appendix"
-      ],
-      "text/plain": [
-       "<IPython.core.display.Latex object>"
-      ]
-     },
-     "metadata": {},
-     "output_type": "display_data"
-    }
-   ],
    "source": [
-    "%%latex\n",
     "\\appendix"
    ]
   },
diff --git a/pdf/book.tplx b/pdf/book.tplx
index 0e955cd..63c83f3 100644
--- a/pdf/book.tplx
+++ b/pdf/book.tplx
@@ -4,7 +4,7 @@
  
 ((* block docclass *))
 \documentclass{book}
-\setcounter{chapter}{-1}
+\setcounter{chapter}{0}
 ((* endblock docclass *))
  
 ((* block preamble *))
@@ -13,7 +13,6 @@
 ((* block title *))
 \title{Kalman and Bayesian Filters in Python}
 \author{Roger R Labbe Jr}
-\date{}
 ((* endblock title *))
  
 ((* block markdowncell scoped *))
diff --git a/pdf/build_book b/pdf/build_book
index 7e1efe0..3607e85 100755
--- a/pdf/build_book
+++ b/pdf/build_book
@@ -5,7 +5,8 @@ echo "merging book..."
 python merge_book.py > Kalman_and_Bayesian_Filters_in_Python.ipynb
 
 echo "creating pdf..."
-ipython nbconvert --to PDF --template book Kalman_and_Bayesian_Filters_in_Python.ipynb
+ipython nbconvert --to latex --template book Kalman_and_Bayesian_Filters_in_Python.ipynb
+ipython to_pdf.py
 
 mv Kalman_and_Bayesian_Filters_in_Python.pdf ..
 echo "done."
diff --git a/pdf/merge_book.py b/pdf/merge_book.py
index 24b25f7..71fca65 100644
--- a/pdf/merge_book.py
+++ b/pdf/merge_book.py
@@ -5,11 +5,11 @@ import sys
 
 
 def remove_formatting(nb):
-    c = nb['cells']
-    for i in range (len(c)):
-        if 'input' in c[i].keys():
-            if c[i]['input'][0:16] == '#format the book':
-                del c[i]
+    cells = nb['cells']
+    for i in range (len(cells)):
+        if 'source' in cells[i].keys():
+            if cells[i]['source'][0:16] == '#format the book':
+                del cells[i]
                 return
 
 
@@ -53,6 +53,11 @@ def merge_notebooks(filenames):
 
 
 if __name__ == '__main__':
+    '''merge_notebooks(
+        ['../00_Preface.ipynb',
+         '../01_g-h_filter.ipynb',
+         '../Appendix_A_Installation.ipynb'])'''
+
     merge_notebooks(
         ['../00_Preface.ipynb',
          '../01_g-h_filter.ipynb',
diff --git a/pdf/short_merge_book.py b/pdf/short_merge_book.py
index d9c39d3..54bb3c7 100644
--- a/pdf/short_merge_book.py
+++ b/pdf/short_merge_book.py
@@ -1,32 +1,29 @@
 from __future__ import print_function
 import io
-from IPython.nbformat import current
+import IPython.nbformat as nbformat
 import sys
 
+
 def remove_formatting(nb):
-    w = nb['worksheets']
-    node = w[0]
-    c = node['cells']
+    c = nb['cells']
     for i in range (len(c)):
-        if 'input' in c[i].keys():
-            if c[i]['input'][0:16] == '#format the book':
+        if 'source' in c[i].keys():
+            if c[i]['source'][0:16] == '#format the book':
                 del c[i]
                 return
 
+
 def remove_links(nb):
-    w = nb['worksheets']
-    node = w[0]
-    c = node['cells']
+    c = nb['cells']
     for i in range (len(c)):
         if 'source' in c[i].keys():
             if c[i]['source'][0:19] == '[Table of Contents]':
                 del c[i]
                 return
 
+
 def remove_links_add_appendix(nb):
-    w = nb['worksheets']
-    node = w[0]
-    c = node['cells']
+    c = nb['cells']
     for i in range (len(c)):
         if 'source' in c[i].keys():
             if c[i]['source'][0:19] == '[Table of Contents]':
@@ -39,7 +36,7 @@ def merge_notebooks(filenames):
     added_appendix = False
     for fname in filenames:
         with io.open(fname, 'r', encoding='utf-8') as f:
-            nb = current.read(f, u'json')
+            nb = nbformat.read(f, nbformat.NO_CONVERT)
             remove_formatting(nb)
             if not added_appendix and fname[0:8] == 'Appendix':
                 remove_links_add_appendix(nb)
@@ -49,14 +46,15 @@ def merge_notebooks(filenames):
         if merged is None:
             merged = nb
         else:
-            merged.worksheets[0].cells.extend(nb.worksheets[0].cells)
-    merged.metadata.name += "_merged"
+            merged.cells.extend(nb.cells)
+    #merged.metadata.name += "_merged"
 
-    print(current.writes(merged, u'json'))
+    print(nbformat.writes(merged, nbformat.NO_CONVERT))
 
 
 if __name__ == '__main__':
     #merge_notebooks(sys.argv[1:])
     merge_notebooks(
-        ['../01_g-h_filter.ipynb',
-         '../02_Discrete_Bayes.ipynb'])
+        ['../00_Preface.ipynb',
+         '../01_g-h_filter.ipynb',
+         '../Appendix_A_Installation.ipynb'])
diff --git a/pdf/to_pdf.py b/pdf/to_pdf.py
new file mode 100644
index 0000000..90795d8
--- /dev/null
+++ b/pdf/to_pdf.py
@@ -0,0 +1,13 @@
+from __future__ import print_function
+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='')
+
+
+p = pdf.PDFExporter()
+p.run_latex('Kalman_and_Bayesian_Filters_in_Python.tex')
+