Note: This pub series (1951-1964) was shared by Hachette and Gallimard, under the respective direction of Georges H. Gallet and Michel Pilotin (as "Stephen Spriel"). In this series, the publication month is indicated by a figure (1 to 12) before the year of printing, on the last page of the book. The publishing data opposite or underneath limits itself to stating the trimester of the same year. This does not apply to the books that were printed in Poland, occasionally as from #81, and regularly as from #97.