Lindgren and Ryun are tied for #1. No one else comes close.
But the following should probably be included in a Top 12 or Top 15:
Rick Riley - Ran 14:00 for 5000m on a dirt track 50 years ago! Also ran 8:48 for full 2-miles by himself, winning by almost 30 seconds.
Eric Hulst - Won the World Junior Cross Country Crown in 1976. Ran 28:55 for 10,000 meters and 8:44 for full 2-miles on dirt.
Rich Kimball - Won the World Junior Cross Country Crown in 1974. Ran 4:02 for full mile and 8:46 for full 2-mile on dirt track.