what is the winter olympics when the country is soviet union and holmenkollen is 1970, 1979?
CREATE TABLE "women_s_10_km" (
  "winner" text,
  "country" text,
  "winter_olympics" real,
  "fis_nordic_world_ski_championships" text,
  "holmenkollen" text
);
SELECT SUM("winter_olympics") FROM "women_s_10_km" WHERE "country"='soviet union' AND "holmenkollen"='1970, 1979';