A instruction book for the David brown DB4 crawler track layer tractor instructions for operating & maintenance, this looks to be a old reprinted version that’s been spiral bound, i have shown some of the photos of the pages to give you a idea of the books content. please study the photos as they form part of the description, please see my other listings for similar David brown books on implements & tractors I am thinning out some of my collection which I have accumulated over the past 50 years.