1. Parts per million; pages per minute

Encyclopedia: Ppm

• Nikolaas Tinbergen
• Nikolai Andreyevich Rimski-Korsakov
• Nikolai Andreyevich Rimsky-Korsakov
• Nikolai Ivanovich Bukharin
• Nikolai Ivanovich Lobachevsky
• Nikolai Lenin
• Nikolai Vasilievich Gogol
• nil
• nil desperandum
• Nile
• Nile blue
• Nile crocodile
• Nile green
• Nile River
• nilgai
• Nilgiri Hills
• nill
• Nilo-Saharan
• Nilo-Saharan language
• Nilotic
• Nilotic language
• nilpotent
• Nilsson
• nim
• nim tree