How many stamps have a face value of 37¢ and were printed in the banknote corporation of america?
create table table_15635768_1 (no_stamps_in_sheet varchar, face_value varchar, printer varchar, PRIMARY KEY (no_stamps_in_sheet))
select count(no_stamps_in_sheet) from table_15635768_1 where face_value = "37¢" and printer = "banknote corporation of america"