They're the 1st two publications to the "Contemporaryý Pračlovek" sequence (Modern-day Caveman). The key strategy was to represent caveman drawings inside a very simple way and products that were being applied At the moment... and also within our days. The first just one — “Kuchyňa Pračloveka” (Caveman's Kitchen area) — https://maplepublishers.com/blog/4-most-popular-self-publishing-uk-services-according-to-records/