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.
The width of the foundation should be twice that of the width of the wall you are building and the wall should be placed in the centre of the foundation. If you need to build a wall 225mm wide the foundation should be 450mm wide.This will give you a foundation overlap of 112mm either side of the finished wall.To work out how thick the wall needs to be (A) you must first work out how deep the garden will be (B) at the point you plan to build the wall.hen you have measured how deep the garden will be you simply divide it by 4 to get the required thickness of wall. If your retaining wall is holding back a 1m depth of garden then it needs to be 225mm thick. The minimum thickness of a garden retaining wall should be the width of a standard brick @ 112mm.