Harmonica (Fallout 3)

Harmonicas are miscellaneous items in Fallout 3 and Fallout: New Vegas.

Characteristics
They are only useful as Rock-It Launcher ammunition. They are somewhat rare except for random placement in containers or on creature bodies. Feral ghouls and centaurs will occasionally have this item in their inventory. A few merchants and traders such as Moira or Crazy Wolfgang will, on occasion, sell around one or two. They also usually appear littered in grocers on a counter or in the aisle. Sometimes swampfolk will carry them, such as bruisers, creepers, etc.

Fallout 3

 * 17 spread throughout Red Racer factory's factory floor
 * 11 inside Meresti Metro station
 * 8 in Evergreen Mills foundry

Fallout: New Vegas

 * 3 on Vault 19's first floor
 * 2 in Vault 11's living quarters
 * 1 in Brooks tumbleweed ranch, on the table next to the ham radio