As some of you may know, many comic book series last through various different writers and artists. However, this does not seem the case with too many prose book series.
Other than Perry Rhodan and Mack Bolan, can anyone think of exceptions?
Oddly enough, not too many prose series since the days of the pulps such as Doc Savage, the Shadow, the Spider, etc. have lasted under multiple authors. Print series comparably open-ended stand as a bit rare.
In print, other than Germany’s Perry Rhodan series and a few other German series, I cannot think of too many others.
http://tvtropes.org/pmwiki/pmwiki.php/Main/LongRunningBookSeries
