They're The very first two publications with the "Modern dayý Pračlovek" sequence (Modern day Caveman). The leading concept was to signify caveman drawings inside a very simple way and products which were used At the moment... and also within our days. The first a person — “Kuchyňa Pračloveka” (Caveman's Kitchen https://maplepublishers.com/blog/5-ways-to-improve-your-book-self-publishing-london/