diff --git a/Doc/lib/libcodecs.tex b/Doc/lib/libcodecs.tex
index d9814409e42..284164333cf 100644
--- a/Doc/lib/libcodecs.tex
+++ b/Doc/lib/libcodecs.tex
@@ -161,7 +161,7 @@ codecs.  Output is also codec-dependent and will usually be Unicode as
 well.}
 
 \var{encoding} specifies the encoding which is to be used for the
-the file.
+file.
 
 \var{errors} may be given to define the error handling. It defaults
 to \code{'strict'} which causes a \exception{ValueError} to be raised
diff --git a/Doc/lib/libfuncs.tex b/Doc/lib/libfuncs.tex
index eeb3be8f85b..936a0232348 100644
--- a/Doc/lib/libfuncs.tex
+++ b/Doc/lib/libfuncs.tex
@@ -975,7 +975,7 @@ class C(B):
   container that supports iteration, or an iterator object.
   If \var{sequence} is already a tuple, it
   is returned unchanged.  For instance, \code{tuple('abc')} returns
-  returns \code{('a', 'b', 'c')} and \code{tuple([1, 2, 3])} returns
+  \code{('a', 'b', 'c')} and \code{tuple([1, 2, 3])} returns
   \code{(1, 2, 3)}.  If no argument is given, returns a new empty
   tuple, \code{()}.
 \end{funcdesc}
diff --git a/Doc/lib/libgopherlib.tex b/Doc/lib/libgopherlib.tex
index e2701f29be0..820f63dfee6 100644
--- a/Doc/lib/libgopherlib.tex
+++ b/Doc/lib/libgopherlib.tex
@@ -7,7 +7,7 @@
 \indexii{Gopher}{protocol}
 
 This module provides a minimal implementation of client side of the
-the Gopher protocol.  It is used by the module \refmodule{urllib} to
+Gopher protocol.  It is used by the module \refmodule{urllib} to
 handle URLs that use the Gopher protocol.
 
 The module defines the following functions:
diff --git a/Doc/lib/libimgfile.tex b/Doc/lib/libimgfile.tex
index 7069dbe732b..3587d85266d 100644
--- a/Doc/lib/libimgfile.tex
+++ b/Doc/lib/libimgfile.tex
@@ -9,7 +9,7 @@
 The \module{imgfile} module allows Python programs to access SGI imglib image
 files (also known as \file{.rgb} files).  The module is far from
 complete, but is provided anyway since the functionality that there is
-is enough in some cases.  Currently, colormap files are not supported.
+enough in some cases.  Currently, colormap files are not supported.
 
 The module defines the following variables and functions:
 
diff --git a/Doc/lib/libitertools.tex b/Doc/lib/libitertools.tex
index 453d16e4d7b..3b705469c9b 100644
--- a/Doc/lib/libitertools.tex
+++ b/Doc/lib/libitertools.tex
@@ -41,7 +41,7 @@ computer equivalent of ``inventory''.
 
 The performance advantage of iterators becomes more acute as the number
 of elements increases -- at some point, lists grow large enough to
-to severely impact memory cache performance and start running slowly.
+severely impact memory cache performance and start running slowly.
 
 \begin{seealso}
   \seetext{The Standard ML Basis Library,
diff --git a/Doc/lib/libmultifile.tex b/Doc/lib/libmultifile.tex
index bdd573e754e..98ccafb25df 100644
--- a/Doc/lib/libmultifile.tex
+++ b/Doc/lib/libmultifile.tex
@@ -121,7 +121,7 @@ ignores trailing whitespace.
 Turn a boundary string into an end-marker line.  By default, this
 method prepends \code{'-}\code{-'} and appends \code{'-}\code{-'} (like a
 MIME-multipart end-of-message marker) but it is declared so it can be
-be overridden in derived classes.  This method need not append LF or
+overridden in derived classes.  This method need not append LF or
 CR-LF, as comparison with the result ignores trailing whitespace.
 \end{methoddesc}
 
diff --git a/Doc/lib/libregex.tex b/Doc/lib/libregex.tex
index 291e96fa5f4..bd86db5db2c 100644
--- a/Doc/lib/libregex.tex
+++ b/Doc/lib/libregex.tex
@@ -315,7 +315,7 @@ the result is a single string; if there are multiple arguments, the
 result is a tuple with one item per argument.  If the \var{index} is
 zero, the corresponding return value is the entire matching string; if
 it is in the inclusive range [1..99], it is the string matching the
-the corresponding parenthesized group (using the default syntax,
+corresponding parenthesized group (using the default syntax,
 groups are parenthesized using \code{{\e}(} and \code{{\e})}).  If no
 such group exists, the corresponding result is \code{None}.