Of all the iPod models, the nano has had the most varied career. We take a look at all seven generations.
Shuffle, Nano, Touch: Two Decades of the Apple iPod
iPod - Wikipedia
FILE--Apple iPod nano music players are for sale at a digital
Apple iPod nano 8 GB Blue (3rd Generation) (Discontinued by
Apple to Declare Last iPod Nano Model 'Vintage' Later This Month
An iPod retrospective: every model ever! - CNET
from the iPod shuffle to the Iphone
The Evolution and Legacy of the iPod - Ellis DownHome
iPod Nano Evolution