CREATE TABLE table_name_50 (riaa_sales_certification VARCHAR, billboard_200_peak VARCHAR, year VARCHAR)

Before the Year 1972, what RIAA Sales Certification was awarded to the song that had a Billboard 200 Peak less than 18?
SELECT riaa_sales_certification FROM table_name_50 WHERE billboard_200_peak < 18 AND year < 1972
SELECT "riaa_sales_certification" FROM "table_name_50" WHERE "billboard_200_peak" < 18 AND "year" < 1972