CREATE TABLE table_name_39 (attendance INTEGER, away_team VARCHAR)
SELECT MAX(attendance) FROM table_name_39 WHERE away_team = "wrexham"
ผู้เข้าชมสูงสุดเมื่อทีมเยือนคือเร็กซ์แฮมคือเท่าใด?
What is the highest Attendance when the away team was Wrexham?