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.
Example: Suppose a wall is to be 20 feet long and 3 feet hight, built with stones that are 6 inches by 10 inches. Then the number of stones needed is. 144(20)(3 + 0.5)/[(6)(10)] = 10080/60 = 168. You should purchase stone blocks to spare in case of breakage.hen fill the base of the trench with coarse gravel, and build the wall so that about 6 inches (0.5 feet) of the wall rests below ground. Leave about 4-6 inches of space between the back of the retaining wall and the soil, then use more coarse gravel for backfill behind the wall.