CREATE TABLE table_52142 ("Year" FLOAT, "Single" TEXT, "U.S. Country" TEXT, "U.S." TEXT, "U.S. AC" TEXT, "Album" TEXT)

What US Country released an album of singles only in 1967?
SELECT "U.S. Country" FROM table_52142 WHERE "Album" = 'singles only' AND "Year" = '1967'
SELECT "U.S. Country" FROM "table_52142" WHERE "Album" = 'singles only' AND "Year" = '1967'