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.
Step-up retaining wall into slope. 1  Compact the wall rock directly behind the block and the next step-up area a minimum of two passes with a plate compactor. 2  Keep in mind the block at each step-up must be completely buried to maintain the proper base depth and to prevent wall failure due to erosion. The depth of the trench is determined by allowing for 6 in. ( 2 150 mm) plus an additional 1 in. ( 3 25mm) for each 1 ft. (300 mm) of wall height for the amount or buried block that is needed. 4  The trench also needs to extend into the slope far enough to bury one full block.**.