CREATE TABLE table_16423070_4 (track_ VARCHAR2, _field VARCHAR2, swimming VARCHAR2, volleyball VARCHAR2)

which country won swimming track & field when lexington won swimming and madison won volleyball
SELECT track_ & _field FROM table_16423070_4 WHERE swimming = "Lexington" AND volleyball = "Madison"
SELECT "track_" & "_field" FROM "table_16423070_4" WHERE "Lexington" = "swimming" AND "Madison" = "volleyball"