They're The 1st two publications for the "Modern-dayý Pračlovek" series (Fashionable Caveman). The leading concept was to signify caveman drawings in the very simple way and products that were made use of at that time... but will also within our times. The first one — “Kuchyňa Pračloveka” (Caveman's Kitchen area) https://maplepublishers.com/blog/how-to-build-your-brand-when-self-publishing-a-book/