CREATE TABLE table_70197 ("Call sign" CLOB, "Frequency MHz" FLOAT, "City of license" CLOB, "ERP W" FLOAT, "Class" CLOB, "FCC info" CLOB)

Which class has a city of Richmond, Virginia?
SELECT "Class" FROM table_70197 WHERE "City of license" = 'richmond, virginia'
SELECT "Class" FROM "table_70197" WHERE "City of license" = 'richmond, virginia'