They're the main two publications to the "Moderný Pračlovek" series (Contemporary Caveman). The principle thought was to represent caveman drawings inside a very simple way and products which have been used at that time... but also within our days. The initial 1 — “Kuchyňa Pračloveka” (Caveman's Kitchen area) — is https://maplepublishers.com/author-portal/reset-password.php