Here you'll find a variety of crocodilian publications for sale, ranging from current books to fairly old publications and reprints. Other herpetological titles are also available. Zoo Book Sales. A highly recommended site for finding both new and used books on crocodiles, alligators and caimans. Books on other species are also available. articles & features:
Laying the First Course. 1  Start at the edge of the wall thatâs most visible, or the edge that butts up against another structure. If your wall goes across a slope, start at the lowest end. 2  Position the first stone in your trench. Make sure the stone is level from front to back and side to side.
Types of Retaining Walls. An earth retaining structure can be considered to have the following types: Gravity Walls Reinforced Gravity Walls. Concrete Cantilever retaining wall. Counter-fort / Buttressed retaining wall. Precast concrete retaining wall. Prestressed retaining wall. Brick.