Album 1700 is the seventh studio album by American folk music trio Peter, Paul and Mary, released in 1967. It produced the band's most successful and final hit, a cover of the John Denver composition "Leaving on a Jet Plane". The album peaked at number 15 on Billboard magazine's Top LP chart and was nominated for a Grammy Award in the Best Folk Performance category. Album 1700 was so named because its original LP issue was Warner Bros. Records catalog number W-1700 for the mono version and WS-1700 for the stereo version. It stayed on the charts and rose again in 1969, thanks to the single release of "Leaving on a Jet Plane".