When I was about 12 or 13, Time-Life Books started issuing a subscription series of books on photography. They were very cheap, but much more than my weekly allowance would cover. I persuaded my father to cover half the cost and every other month a new volume would arrive. I devoured them. Initially a series of 8, they subsequently extended the series but we had left the country by then so I only have the original set. Still a worthy source for the budding young photographer.