Working on this series has become a trip down memory lane, reviewing my own work from five, ten and even as far back as twenty years ago or more. It has also been necessary at times to revamp such work as new and more detailed information has become available since it was created.

Working on this series has become a trip down memory lane, reviewing my own work from five, ten and even as far back as twenty years ago or more. It has also been necessary at times to revamp such work as new and more detailed information has become available since it was created.