The United States's Julin nuclear test series was a group of 7 nuclear tests conducted in 1991–1992.
 These tests followed the "Operation Sculpin" series, and were the last before negotiations began for the Comprehensive Test Ban Treaty.
The Soviet Union's 1988 nuclear test series was a group of 16 nuclear tests conducted in 1988.
 These tests followed the "1987 Soviet nuclear tests" series and preceded the "1989 Soviet nuclear tests" series.
The 1986–1988 French nuclear tests were a group of 24 nuclear tests conducted between 1986 and 1988.
 These tests followed the "1983–85 French nuclear tests" series and preceded the "1989–91 French nuclear tests" series.
The Soviet Union's 1989 nuclear test series was a group of 7 nuclear tests conducted in 1989.
 These tests followed the "1988 Soviet nuclear tests" series and preceded the "1990 Soviet nuclear tests" series.
The France's In Ekker nuclear test series was a group of 14 nuclear tests conducted in 1961-1966.
 These tests followed the "Reggane series, French nuclear tests" series and preceded the "1966–70 French nuclear tests" series.
The United States's Sculpin nuclear test series was a group of 7 nuclear tests conducted in 1990-1991.
 These tests followed the "Operation Aqueduct" series and preceded the "Operation Julin" series.
The Soviet Union's 1987 nuclear test series was a group of 24 nuclear tests conducted in 1987.
 These tests followed the "1985 Soviet nuclear tests" series and preceded the "1988 Soviet nuclear tests" series.
The France's 1966–1970 nuclear test series was a group of 22 nuclear tests conducted in 1966–1970.
 These tests followed the "In Ekker series, French nuclear tests" series and preceded the "1971–74 French nuclear tests" series.
Operation Hardtack I was a series of 35 nuclear tests conducted by the United States from April 28 to August 18 in 1958 at the "Pacific Proving Grounds".
 At the time of testing, the Operation Hardtack I test series included more nuclear detonations than all prior nuclear explosions in the Pacific Ocean put together.
 These tests followed the "Project 58/58A" series, which occurred from 1957 December 6 to 1958, March 14, and preceded the "Operation Argus" series, which took place in 1958 from August 27 to September 6.
The United States's Aqueduct nuclear test series was a group of 10 nuclear tests conducted in 1989-1990.
 These tests followed the "Operation Cornerstone" series and preceded the "Operation Sculpin" series.

Question: What nuclear series tests followed Operation Sculpin?
Answer: Operation Julin