Soyuz 22 ("Union 22") was an earth-sciences mission using a modified Soyuz spacecraft that had served as a backup for the Apollo-Soyuz Test Project mission the previous year.
Soyuz 22 ("Union 22") was an earth-sciences mission using a modified Soyuz spacecraft-Soyuz Test Project mission the previous year. This modified Soyuz spacecraft had served as a backup for the Apollo.