Camp fire songs are best learnt at camp fires, not from books. Most of them are pretty simple and easy to learn. As such, they don't mean much unless they are performed with a somewhat over the top enthusiasm. Many of them have actions which are easy to show but difficult to write down.
Camp fires form part of the oral tradition and may be the first contact young people have for singing in an informal setting. They are thus a corner stone of folk music. I went to my first camp fire as a Cub aged 9 and, as an adult, I having been passing those songs down to generations of kids for almost 40 years.