The Encyclopedia of Psychoactive Drugs series is generally well-balanced and informational. While Heroin: The Street Narcotic follows with those traits, it is also an exception, in that it contains a number of relatively prominent errors. It looks like the updated version (1992) may have tried to fix errors introduced in the original version, but in some cases just further confused the issues. It still serves as a reasonable overview of the history and nature of Heroin, but check your facts before using it as a reference.