I can not display my mongodb data with mongoose in node.js

//myapp/routes/index.js
//declaramos las dependencias
var express = require('express');
var bodyParser = require('body-parser');
var mongoose = require('mongoose'),
	Schema =mongoose.Schema;
var router = express.Router();
mongoose.connect("mongodb://localhost/Libros",function(err){
	if(err){

	}else{
		console.log('conectado a mongodb');
	}
});

var LibrosSchema =new Schema({
	nombre: String,
	anio: Number,
	autor: String,
	pais: String,
	Region:String,
	descripcion:String,
	foto: String
});

var Libross = mongoose.model('Libros',LibrosSchema);
/* GET home page. */
router.get('/', function(req, res, next) {
	Libross.find(function(err, doc){
		console.log(doc);
		console.log("resivido");
		//res.send(Libros);
	});
  //res.render('index', { title: 'Express' });
  res.send('respond with a resource');
});

module.exports = router;