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_name_50 (riaa_sales_certification VARCHAR, billboard_200_peak VARCHAR, year VARCHAR)

### Question ###
Before the Year 1972, what RIAA Sales Certification was awarded to the song that had a Billboard 200 Peak less than 18?

### Accurate SQL ###

SELECT riaa_sales_certification FROM table_name_50 WHERE billboard_200_peak < 18 AND year < 1972