[SJackson]

Until just after WWII, it was a criminal offense to write a book on this subject.

I presuume you're talking about Britain, not the US. If not, I'd be interested in the background of that assertation. If you're speaking about the Brits, that might be interesting to hear about as well.

[Hunble]

I do not have the exact dates available at the moment, but if interested, send me a private FR mail and I will get the exact dates for you.

As I understand it, Britain was the first to make publishing books on this subject legal, and the United States followed about 5 years later.

Tonight, I can only go by memory. However, I will provide exact information to those who request it, once I have a chance do dig out my old books and verify the information.

By the early 1970's, books on this subject became commonly available in the United States. In 1972, I read my first book on this subject in the local library.