Spear & Jackson 16" Draining Spade is a solid forged steel heavy duty shovel that can be specifically used for extending narrow trenches and drainage channels. This product from Spear and Jackson is also perfect to use when laying pipes and cables.
eBay
ISBN-13: 9783319242248, 978-3319242248. The book is a realistic blend of basic knowledge and understanding in soil physical properties. Only basic mathematical knowledge is necessary to understand and apply the proven principles covered.
eBay