Wayne is a popular writer in the firearm/outdoor magazine genre. We discussed his survival knife in an earlier thread . Writers look around in their field, see a resource and exploit it. This particular resource is the survival manual genre, and the kindling for new fires is getting rather sparce. Few authors will kick at a overlooked stump and share a treasure of fat grubs. For a durable, pocket manual get the SAS GEM. Kochanski, Cody and several others are masters at regional information. Military manuals are a decent resource, though the neat illustrations of shelters with the geometric precision of a barracks bedcorner always look different where Mother Nature abhors a straight line.