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Removing book navigation

Remove book entirely, with hook_page_alter()

 * Implements hook_page_alter().
function example_page_alter(&$page) {
// Remove the book module's navigation.
  // dpm($page);
$nid = variable_get('sdl_about_daniel_nid', 18);
  if (isset(
$page['content']['system_main']['nodes'][$nid]['book_navigation'])) {

Note: This can be done with a more targeted hook than hook_page_alter().

Or, at the opposite extreme, a surgical removal of the book listing pages, keeping the next/previous links:

function example_preprocess_book_navigation(&$variables) {
 $variables['tree'] = '';


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