 Prior to March 1, 1991, the only means of tracking sales figures for record albums and singles in the United States was via the certification system of the Recording Industry Association of America (RIAA), based specifically on shipments (less potential returns) on a long-term basis.According to the most recent record album certifications, the holiday album title that has shipped the most copies in the United States is Elvis Presley's 1957 LP "Elvis' Christmas Album", which is certified by the RIAA for shipment of 17 million copies in the U.S. (3 million copies of the original 1957 release on RCA Victor Records, plus 10 million copies of a "budget" edition first released by RCA Camden in 1970 and then by Pickwick Records in 1975, and 4 million copies of a BMG reissue titled "It's Christmas Time" released in 1985).From March 1, 1991, through the present day, the Nielsen SoundScan tracking system has been more widely used to accurately track sales of record albums and singles at the point of sale (POS) based on inventory bar code scans.