Alchemical Symbolism in the VMS

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I find interesting that at least two alchemical printed books conatain a big folded folio (not sure how to name this correctly), but both of them are of the XVII c.:
1. Johann Daniel Mylius. Tractatus III. Seu basilia philosophica. 1618. You are not allowed to view links. Register or Login to view.
2. Elias Ashmole. Theatrum chemicum britannicum. Ripley's Wheel.1652. You are not allowed to view links. Register or Login to view.
The images are fromYou are not allowed to view links. Register or Login to view..
The latter image is interesting as it also contains a scheme, which has some resemblance with the Rosettes page. I remember someone mentioned this page in some thread, but I couldn't find it either for "Theatrum Chemicum" or for "Ripley's Wheel". Possibly, it was not on here.
How often such big folded folios were inserted into books? Of course, besides of usual maps. How long has this tradition been established?