Pioneer 10 (Pioneer F) –  Jupiter, interstellar medium, launched March 1972
Pioneer 11 (Pioneer G) –  Jupiter, Saturn, interstellar medium, launched April 1973
Pioneer H  – identical to Pioneers 10 and 11.
 Proposed out-of-ecliptic mission for 1974, never built.
Pioneer 10 (Pioneer F) –  Jupiter, interstellar medium, launched March 1972
Pioneer 11 (Pioneer G) –  Jupiter, Saturn, interstellar medium, launched April 1973
Pioneer H  – identical to Pioneers 10 and 11.  Proposed out-of-ecliptic mission for 1974, never built.
Pioneer program