Organic Sources of Nutrients

from Stuart Robertson's "Tips on Container Gardening"

Alfalfa meal (nitrogen)
Blood meal (nitrogen)
Bone meal (phosphor)
Cottonseed meal (nitrogen)
Crab meal (nitrogen)
Egg shells (calcium)
Feather meal (nitrogen)
Fish meal (nitrogen)
Fish bone meal (phosphor)
Granite dust (potassium)
Gypsum (calcium, sulphur)
Hoof meal (nitrogen)
Kelp (potassium)
Limestone (calcium, magnesium)
Manure (nitrogen, phosphor)
Rock phosphate (phosphor)
Shrimp meal (nitrogen)
Soybean meal (nitrogen)
Woodash (potassium)

Have you taken your N, P, P today? Seriously, where can one find some of these more exotic nutrients?