A Martian Diptych
Welcome To Mars and "No Jokes on Mars" have a common setting.
The Galactic Cluster Trilogy
"This Earth of Hours" refers back to "Nor Iron Bars" which refers back to "Common Time."
The Heart Stars Trilogy
Both
Mission To The Heart Stars and "A Dusk of Idols" refer back to
The Star Dwellers.
The Quincunx Trilogy
Midsummer Century refers back to
The Quincunx Of Time which refers forward to "A Style In Treason" and to
Midsummer Century.
Characters
Adolph Haertel is in
Welcome To Mars and "Common Time."
Jack Loftus is in
The Star Dwellers and
Mission To The Heart Stars.
Thor Wald is in
The Quincunx Of Time and mentioned in
Midsummer Century.
In
Quincunx, Wald invents the Dirac transmitter which exists in a different form in
Cities In Flight.
