Tracking video or book?

I am looking for a good book that explains tracking and spoors of african game,must include warthog and bushpig.If anyone know's a good one please let me know.
Thanks

Aside from the various hunting "how to" books out there a really good tracking resource is the Selous Scout's history webpage; Selous Scouts "PAMWE CHETE". They were famous for their ability to track man and animal under combat conditions. It takes a good bit of clicking but you can drill down into some nice how to articles for spooring wild game and the wildest of game.