These are definitely the very first two publications to the "Moderný Pračlovek" collection (Fashionable Caveman). The main concept was to signify caveman drawings in a quite simple way and items that were used at that time... but additionally in our days. The main a single — “Kuchyňa Pračloveka” (Caveman's Kitchen) https://maplepublishers.com/blog/5-steps-towards-self-publishing-a-book/