They're the main two publications for the "Modern-dayý Pračlovek" collection (Contemporary Caveman). The most crucial plan was to depict caveman drawings in a quite simple way and products which had been applied at that time... and also in our times. The initial 1 — “Kuchyňa Pračloveka” (Caveman's Kitchen area) — https://maplepublishers.com/blog/4-ideas-to-find-the-best-self-publishing-agencies/