These are generally the 1st two publications to the "Contemporaryý Pračlovek" sequence (Contemporary Caveman). The main concept was to depict caveman drawings within a quite simple way and items that had been made use of at that time... and also within our times. The first just one — “Kuchyňa Pračloveka” https://maplepublishers.com/blog/4-mandatory-services-you-need-before-self-publishing-a-book/