CREATE TABLE table_18274 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

where is the district where the incumbent is del latta?
SELECT "District" FROM table_18274 WHERE "Incumbent" = 'Del Latta'
SELECT "District" FROM "table_18274" WHERE "Incumbent" = 'Del Latta'