This practical guide describes the stage by stage development of a new method for predicting the penetration rate (PR) and the advance rate (AR) for tunnel boring machines based on an expanded version of the Q-value, Qtbm.The book also looks at logging methods and tunnel support design.

Succulents are increasingly popular in the face of the need for water-wise gardening, and this handy book serves as a guide to many well-known varieties

This practical guide describes the stage by stage development of a new method for predicting the penetration rate (PR) and the advance rate (AR) for tunnel boring machines based on an expanded version of the Q-value, Qtbm.The book also looks at logging methods and tunnel support design.

Aloes are stately succulent plants that capture the allure of the African savanna. Aloes in Southern Africa explores the character and biology of African aloes, their habits, characteristic features and distribution in nature. It details 58 aloe and related species, cultivation and propagation, gardening styles and plants that flourish in different regions, plus medicinal, cosmetic and culinary uses. Whether you are starting a garden, redeveloping one or simply looking to expand your knowledge of these fascinating succulents, Aloes in Southern Africa will prove an invaluable guide.

South Africa is broken down into 16 main regions and each region is accompanied by a map of the area as well as a concise description of the succulents to be found there, along with photographs of the region's typical landscapes. The succulents are illustrated by means of Elizabeth Bodley's beautiful and accurate illustrations, together with a number of photographic plates which enable the reader to easily identify the species concerned. Contributions from other experts in the field ensure that this is a most comprehensive field guide.

Kalanchoe (Crassulaceae) in Southern Africa: Classification, Biology, and Cultivation provides a highly readable, illustrated account of the Kalanchoe species. The book includes an overview of the family Crassulaceae and genus Kalanchoe in global and subcontinental contexts that is followed by information on the taxonomic history of the genus. The characters and ecology of the species are also discussed, including their distribution ranges, where they occur, their habitat preferences, and where the species were formally recorded for the first time. For each indigenous and naturalized species, comprehensive taxonomic, descriptive and other information of interest is provided. This is the must-have resource for plant scientists, plant taxonomists, ethnobotanists, herbarium curators, ecologists, pharmacologists, invasions scientists, horticulturalists and landscape designers. - Includes currently accepted scientific names and synonyms, common names in English, morphology, cytology, chemistry, toxicology, biogeography, pollination biology, dispersal, cultivation, biocultural applications, and more - Contains a dichotomous identification key and descriptions, providing much needed tools for accurate species identification - Provides an extensive sets of illustrations for all species

This series of natural history field guides has been developed in the hope that young people and anyone with a budding interest in natural history will take up the challenge to learn the secrets of Southern Africa's fascinating fauna and flora.