urlpattern problem !

i have an another problem

my urlpattern is :

from django.conf.urls.defaults import *

urlpatterns = patterns('',

(r'^admin/', include('django.contrib.admin.urls')),
)
even i try with this code again

from django.conf.urls.defaults import *

# Uncomment the next two lines to enable the admin:

from django.contrib import admin
admin.autodiscover()

urlpatterns = patterns('',
# Example:
# (r'^mysite/', include('mysite.foo.urls')),

# Uncomment the admin/doc line below and add
'django.contrib.admindocs'
# to INSTALLED_APPS to enable admin documentation:
# (r'^admin/doc/', include('django.contrib.admindocs.urls')),

# Uncomment the next line to enable the admin:
(r'^admin/', include(admin.site.urls)),
)

but when i login in my admin page i cant see all of my objects( like
Publisher, Author, ...)
http://www.djangobook.com/en/1.0/chapter06/
i just have groups , users , sites .
can you help me

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