Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_19534677_1 ( material_collected VARCHAR, volume_title VARCHAR )

### Question ###
Name the total number of material collected for justice league of america by george p rez, vol. 2

### Accurate SQL ###

SELECT COUNT(material_collected) FROM table_19534677_1 WHERE volume_title = "Justice League of America by George Pérez, Vol. 2"