Made as part of the LIFE Artemis project, a Slovenian project that works on education about invasive exotic species in forests.
They have previously put a Slovenian version of this book online. The new English version is not a literal translation: the entire text has been adapted to an international target group and a number of species have been replaced.
The species descriptions are also posted on the project website.
Original unreadable version, probably in Slovenian: https://www.invazivke.si/dat/prirocnik.pdf