Like Striker5 I too read them as a kid. I found them facinating. They are on my "someday" list of things to buy.
One time thinking I knew something they didn't I brought up some topics from the books with my grandparents. Suprise, they not only knew about it but had "been there, done that" in many instances. They are long gone now. I wish I had paid better attention when they were here. A lot of info died with them.
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