SELECT AVG("Rebs") FROM table_78348 WHERE "From" = '1976' AND "Asts" > '67'
What is the average rebounds for players from 1976 and over 67 assists?
CREATE TABLE table_78348 (
    "Player" text,
    "Pos." text,
    "From" real,
    "School/Country" text,
    "Rebs" real,
    "Asts" real
)