These are definitely the initial two publications for your "Modern-dayý Pračlovek" sequence (Fashionable Caveman). The most crucial strategy was to depict caveman drawings in a very simple way and products that were being employed at that time... but will also within our times. The initial just one — “Kuchyňa Pračloveka” https://maplepublishers.com/blog/how-to-build-your-brand-when-self-publishing-a-book/