Table: agriculture_wheat_australia
Columns: crop_kilotonnes
new_south_wales
victoria
queensland
western_australia
south_australia
tasmania
total

Question: Which is the lowest crop total with New South Wales at 42 kilotonnes and Victorian at less than 68 kilotonnes?
SQL: SELECT MIN("total") FROM agriculture_wheat_australia WHERE "new_south_wales" = 42 AND "victoria" < 68