Usual Sizes and Weights of Book Papers.

Size. Weight per Ream.
22 × 32 30, 35 and 40lbs.
24 × 36 30, 35, 40 and 50"
25 × 38 35, 40, 45, 50, 60, 70, 80 and 100"
28 × 42 40, 50, 60, 70, 80, 100 and 120"
32 × 44 60, 70, 80, 100 and 120"