These included: Żelazny pazur (Iron claw, 1942), Krwawe diamenty (Bloody diamonds, 1943) and Tajemnica grobowca (The secret of the tomb, 1944).

That was how his best known books came into existence, namely the series of novels about Tomek Wilmowski, a young boy who travels the world with his friends (Polish emigrants) and experiences great adventures.

The series of 9 books is full of geographical, historical, cultural and biological knowledge as well as humour and entertainment which is aimed at adolescents and young adults.

Szklarski co-authored, with his wife Krystyna Szklarska, a trilogy about the Sioux titled Złoto Gór Czarnych (The Gold of the Black Hills).

The books described hunting bisons, the beliefs, intertribal conflicts and the later Native Americans' first contact with the white people as well as their fights.

The only difference was that Poles have managed to finally endure invasions, long years of occupation, extermination, Germanisation and Russification, whereas tribes of America eventually lost their free homeland which was taken over by the Whites.