CREATE TABLE table_67340 ("Call sign" TEXT, "Frequency MHz" TEXT, "City of license" TEXT, "ERP W" FLOAT, "Class" TEXT, "FCC info" TEXT)

What is the smallest ERP for allentown, pennsylvania?
SELECT MIN("ERP W") FROM table_67340 WHERE "City of license" = 'allentown, pennsylvania'
SELECT MIN("ERP W") FROM "table_67340" WHERE "City of license" = 'allentown, pennsylvania'