"Harness Making" by Paul N. Hasluck is a comprehensive guide to the knowledge of harness making. The book contains detailed information on the tools and materials required for harness making, covering cutting tools, punches, awls, needles, waxed thread preparation, types of nails and tacks, dyeing of leather, flocks, felt, and various types of leather. With numerous illustrations, it serves as a valuable resource for both beginners and experienced harness makers, focusing on craftsmanship and techniques involved in leatherworking.