CREATE TABLE table_19534677_1 (material_collected VARCHAR2, volume_title VARCHAR2)

Name the total number of material collected for justice league of america by george p rez, vol. 2
SELECT COUNT(material_collected) FROM table_19534677_1 WHERE volume_title = "Justice League of America by George Pérez, Vol. 2"
SELECT COUNT("material_collected") FROM "table_19534677_1" WHERE "Justice League of America by George Pérez, Vol. 2" = "volume_title"