James Blish's Haertel Scholium could be published in a single omnibus volume internally divided as follows:
ADOLPH HAERTEL
Welcome To Mars
Galactic Cluster
JACK LOFTUS
The Star Dwellers
Mission To The Heart Stars
THOR WALD
The Quincunx Of Time
A Midsummer Cenury
FIVE OTHERS
"No Jokes on Mars"
"How Beautiful With Banners"
"And Some Were Savages"
"A Dusk Of Idols"
"A Style In Treason"
By Galactic Cluster, I mean only the short trilogy, one story featuring Haertel and two sequels. There are reasons why I think that these works in this order make sense but it would need to be discussed if it ever became a practical proposition!