They are the primary two publications for your "Modern-dayý Pračlovek" sequence (Contemporary Caveman). The principle strategy was to stand for caveman drawings in the quite simple way and items that were used at that time... and also within our times. The very first one particular — “Kuchyňa Pračloveka” (Caveman's Kitchen) https://maplepublishers.com/blog/what-you-must-know-about-selling-your-self-published-books/