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( ! ) Warning: mysqli_fetch_assoc() expects parameter 1 to be mysqli_result, null given in C:\wamp\www\BACKUP_RESTO 247\buscador\php\libros.php on line 43
( ! ) Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, null given in C:\wamp\www\BACKUP_RESTO 247\buscador\php\libros.php on line 44