That's true. And you got cow bones, huh? Old cow bones, old manure. Turn of the century....

Lincoln Rhyme:

Nitrogen rich, explosive carbons, where do you find those in New York City? Paulie:
Bomb sites, shooting ranges. Amelia:
Maybe an old fort or an armory? Eddie Ortiz:
Let's not forget the shit factor, guys. Lincoln Rhyme:
The what? Eddie Ortiz:
Manure becomes a nitrate when it's aged. Lincoln Rhyme:
That's true. And you got cow bones, huh? Old cow bones, old manure. Turn of the century. Cows, farms... pastures, rats... dead cows. Where do you find... In stockyards... slaughterhouses, that's what we want to look for