CREATE TABLE table_51998 ("Date of Issue" CLOB, "Denomination" CLOB, "Design" CLOB, "Paper Type" CLOB, "First Day Cover Cancellation" CLOB)

What type of paper is the 1 cent denominations made on?
SELECT "Paper Type" FROM table_51998 WHERE "Denomination" = '1 cent'
SELECT "Paper Type" FROM "table_51998" WHERE "Denomination" = '1 cent'