Share: Title:Introduction to USA NPN and NN Duration: 6:15 Plays: 1.2K views Published: 7 years ago Download MP3 Download MP4 Simillar Videos ▶️ 5:39 Usa-npn's Visualization Tool: Phenology Maps Part 1 - Accumulated Growing Degree Days 1.2K views • 8 years ago ▶️ 3:54 Usa-npn's Visualization Tool Part 1: Orientation 1.2K views • 9 years ago ▶️ 3:50 Usa-npn's Visualization Tool: Phenology Maps Part 2 - Spring Indices 1.2K views • 8 years ago ▶️ 4:00 Usa-npn's Visualization Tool Part 3: Calendar 1.2K views • 9 years ago