I devoured both series from beginning to end numerous times as a child. I’ve probably easily read each book in the series at least five times, well although published before let’s say 1982. I would read them in the car, under the covers at night with my trusty flash light, by the pool, instead of text books. Well, you get the picture. LOL Heck, I even remember reading Hardy Boys books out loud to my little brother. I do so love a good mystery novel.