These are the initial two publications with the "Moderný Pračlovek" series (Modern Caveman). The primary thought was to signify caveman drawings inside a quite simple way and products which ended up utilised at that time... but also within our times. The first 1 — “Kuchyňa Pračloveka” (Caveman's Kitchen area) — https://maplepublishers.com/blog/what-you-must-know-about-selling-your-self-published-books/