Notes: La chasse au météore ends on page 234 followed by two-page table of contents (numbered pages). Le pilote du Danube restarts page numbers with [1] and ends on page 234 followed by a one-page table of contents (numbered). An inscription at the bottom of the cover seems to be "ENREI REI". George Roux credited for omnibus and individual titles. Sources:

• Scanned copy at Gallica: title, format, publisher, illustrator. Specifies both "Les voyages extraordinaires" and "Collection Hetzel". Library catalogue gives 1908.
• jv.gilead.org.il: gives two different dates, each matching the publication date of the corresponding in-8 hard cover. The later date (15 November 1908) was used.