Sorting these covers by decade
Kometen kommer (Kometjakten) by decade
Tove Jansson
24 covers from 25 printings with a known year, 2020s back to 1940s
2020s
4 covers · 2 of 4 printings say hardcover · 4 publishers, L'Altra Tribu and Esperanto-Asocio de Britio among them · 3 languages
2010s
3 covers · 3 publishers, Arena and Ayrıntı Yayınları among them · 2 languages
2000s
5 covers · 5 publishers, Siruela and Arena among them · 4 languages
1990s
4 covers · 5 publishers, Benziger bei Arena and Nasza Księgarnia among them · 3 languages
1980s
1 cover · 1 publisher, Black
1970s
2 covers · 2 publishers, Ravensburger and Puffin Books among them
1960s
2 covers · 2 publishers, Benziger and Penguin among them · 2 languages
1950s
2 covers · 2 publishers, Penguin and E. Benn among them
1940s
1 cover · 1 publisher, Schildt
Covers from Open Library, each in the decade of the earliest printing that carries it. What the catalogues never scanned is missing here too. See the whole wall.