query: What were the results of The Sample-return missions in 1969, 1970, 1971 1974 and 1975?
answer: The Sample-return missions failed were Kosmos 300 and Kosmos 305 in 1969, Luna E-8-5 No. 405 in 1970, Luna E-8-5M No. 412 in 1975 at unsuccessful launches and Luna 18 in 1971 and Luna 23 in 1974 at unsuccessful landings on the Moon.