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_66823 ( "Call sign" text, "Frequency MHz" real, "City of license" text, "ERP W" real, "FCC info" text )

### Question ###
Name the average ERP W when it has a city of license of pound, virginia and frequency mhz more than 91.3

### Accurate SQL ###

SELECT AVG("ERP W") FROM table_66823 WHERE "City of license" = 'pound, virginia' AND "Frequency MHz" > '91.3'