Merrett, H. S. (1897). A practical treatise on the science of land and engineering surveying, leveling, estimating quantities, etc.: With a description of the various instruments required, etc. ... with illustrations (5th ed., revised and corrected.). E. & F.N. Spon Limited.

Merrett, Henry S. A Practical Treatise on the Science of Land and Engineering Surveying, Leveling, Estimating Quantities, Etc.: With a Description of the Various Instruments Required, Etc. ... with Illustrations. 5th ed., revised and corrected. E. & F.N. Spon Limited, 1897.