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proposed fuel tanker; cancelled in 1964 when the Soyuz 7K and Soyuz P were cancelled
* L3-1963 crewed lunar lander proposal (1963)
* L4-1963 crewed lunar orbiter proposal; modified 7K (1963)
* Soyuz 7K-OK (1967-1970)
** Soyuz 7K-L1 Zond (1967-1970)
** Soyuz 7K-L3 LOK (1971-1972)
** Soyuz 7K-OKS (1971);

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