The incredibly strong, modern-day caveman. Availability for Collectors
While many "extra quality" PDF packs circulate in fan communities, please note that Bob et Bobette
Given this information, it appears you're describing a digital collection of "Bob et Bobette" comics, specifically a comprehensive pack that includes a range of the series (from issue 67 to 151), compiled into 21 albums, available in high-quality PDF format in French.
Thematic collections (e.g., educational or holiday specials). Anniversary or "Hommage" editions. Digital Access and Quality
Below is an informative paper that explains what this string means, the series it refers to, and the legal/quality issues implied.
