diff --git a/doc/src/Eqs/bond_mm3.jpg b/doc/src/Eqs/bond_mm3.jpg
deleted file mode 100644
index 2c17739db5..0000000000
Binary files a/doc/src/Eqs/bond_mm3.jpg and /dev/null differ
diff --git a/doc/src/Eqs/bond_mm3.tex b/doc/src/Eqs/bond_mm3.tex
deleted file mode 100644
index 549500ebac..0000000000
--- a/doc/src/Eqs/bond_mm3.tex
+++ /dev/null
@@ -1,9 +0,0 @@
-\documentclass[12pt]{article}
-
-\begin{document}
-\thispagestyle{empty}
-$$
-  E = K (r - r_0)^2 \left[ 1 - 2.55(r-r_0) + (7/12) 2.55^2(r-r_0)^2 \right]
-$$
-
-\end{document}
diff --git a/doc/src/bond_mm3.rst b/doc/src/bond_mm3.rst
index 4096a34d48..5794592ce4 100644
--- a/doc/src/bond_mm3.rst
+++ b/doc/src/bond_mm3.rst
@@ -1,13 +1,13 @@
-.. index:: bond\_style mm3
+.. index:: bond_style mm3
 
-bond\_style mm3 command
-=======================
+bond_style mm3 command
+======================
 
 Syntax
 """"""
 
 
-.. parsed-literal::
+.. code-block:: LAMMPS
 
    bond_style mm3
 
@@ -15,7 +15,7 @@ Examples
 """"""""
 
 
-.. parsed-literal::
+.. code-block:: LAMMPS
 
    bond_style mm3
    bond_coeff 1 100.0 107.0
@@ -26,10 +26,12 @@ Description
 The *mm3* bond style uses the potential that is anharmonic in the bond
 as defined in :ref:`(Allinger) <mm3-allinger1989>`
 
-.. image:: Eqs/bond_mm3.jpg
-   :align: center
+.. math::
 
-where r0 is the equilibrium value of the bond, and K is a
+   E = K (r - r_0)^2 \left[ 1 - 2.55(r-r_0) + (7/12) 2.55^2(r-r_0)^2 \right]
+
+
+where :math:`r_0` is the equilibrium value of the bond, and :math:`K` is a
 prefactor. The anharmonic prefactors have units angstrom\^(-n):
 -2.55 angstrom\^(-1) and (7/12)2.55\^2 angstrom\^(-2). The code takes
 care of the necessary unit conversion for these factors internally.
@@ -41,8 +43,8 @@ The following coefficients must be defined for each bond type via the
 the data file or restart files read by the :doc:`read\_data <read_data>`
 or :doc:`read\_restart <read_restart>` commands:
 
-* K (energy/distance\^2)
-* r0 (distance)
+* :math:`K` (energy/distance\^2)
+* :math:`r_0` (distance)
 
 Restrictions
 """"""""""""
@@ -69,8 +71,3 @@ Related commands
 
 **(Allinger)** Allinger, Yuh, Lii, JACS, 111(23), 8551-8566
 (1989),
-
-
-.. _lws: http://lammps.sandia.gov
-.. _ld: Manual.html
-.. _lc: Commands_all.html
diff --git a/doc/txt/bond_mm3.txt b/doc/txt/bond_mm3.txt
deleted file mode 100644
index c3d0e39f52..0000000000
--- a/doc/txt/bond_mm3.txt
+++ /dev/null
@@ -1,58 +0,0 @@
-"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c
-
-:link(lws,http://lammps.sandia.gov)
-:link(ld,Manual.html)
-:link(lc,Commands_all.html)
-
-:line
-
-bond_style mm3 command :h3
-
-[Syntax:]
-
-bond_style mm3 :pre
-
-[Examples:]
-
-bond_style mm3
-bond_coeff 1 100.0 107.0 :pre
-
-[Description:]
-
-The {mm3} bond style uses the potential that is anharmonic in the bond
-as defined in "(Allinger)"_#mm3-allinger1989
-
-:c,image(Eqs/bond_mm3.jpg)
-
-where r0 is the equilibrium value of the bond, and K is a
-prefactor. The anharmonic prefactors have units angstrom^(-n):
--2.55 angstrom^(-1) and (7/12)2.55^2 angstrom^(-2). The code takes
-care of the necessary unit conversion for these factors internally.
-Note that the MM3 papers contains an error in Eq (1):
-(7/12)2.55 should be replaced with (7/12)2.55^2
-
-The following coefficients must be defined for each bond type via the
-"bond_coeff"_bond_coeff.html command as in the example above, or in
-the data file or restart files read by the "read_data"_read_data.html
-or "read_restart"_read_restart.html commands:
-
-K (energy/distance^2)
-r0 (distance) :ul
-
-[Restrictions:]
-
-This bond style can only be used if LAMMPS was built with the
-USER_YAFF package.  See the "Build package"_Build_package.html doc
-page for more info.
-
-[Related commands:]
-
-"bond_coeff"_bond_coeff.html
-
-[Default:] none
-
-:line
-
-:link(mm3-allinger1989)
-[(Allinger)] Allinger, Yuh, Lii, JACS, 111(23), 8551-8566
-(1989),