These are generally the first two publications with the "Moderný Pračlovek" collection (Fashionable Caveman). The main thought was to represent caveman drawings in a very very simple way and products which were being used at that time... but will also in our days. The very first 1 — “Kuchyňa Pračloveka” https://maplepublishers.com/blog/5-ways-to-improve-your-book-self-publishing-london/