They're The 1st two publications for the "Moderný Pračlovek" series (Modern Caveman). The main idea was to represent caveman drawings in a very simple way and products that were applied at that time... and also in our times. The initial 1 — “Kuchyňa Pračloveka” (Caveman's Kitchen area) — is an https://maplepublishers.com/blog/what-qualities-are-found-in-the-best-self-publishing-companies-uk/