They're the very first two publications with the "Modern-dayý Pračlovek" collection (Modern Caveman). The principle idea was to symbolize caveman drawings in a very quite simple way and products that ended up utilised at that time... but additionally within our days. The first a person — “Kuchyňa Pračloveka” (Caveman's Kitchen) https://maplepublishers.com/blog/5-ways-to-improve-your-book-self-publishing-london/