1. 1990-01-01 Bridges are a part of the transportation system of a region. They are used to span an obstacle like a stream or chasm. Bridges make the system more efficient either by saving travel distance or by enabling vehicles or pedestrians to reach places that were previously inaccessible. There are four...
  2. 1965-01-01 Concrete is a strong and inexpensive construction material when it is properly prepared and used. This introduction explains the importance of a good mixture and describes the materials used in the mixture. Following this are entries on: Calculating amounts of materials for concrete Mixing...
  3. 2022-01-28 This book describes the method and materials used to build a storm-proof ‘cyclone house’ in Vanuatu. An appendix offers the opportunity for further discussion of the environmental issues it raises. It uses material from an article by Jon Letman, sponsored by the Judith Neilson Institute, courtesy...
  4. 1990-01-01 The majority of farmers in the world still practise some form of subsistence farming. Their draught-animal and handwork-based farming practices, however, cannot be compared with the completely mechanised and highly automated precision-farming practices that are becoming the norm for many of their...
  5. 1995-01-01 This book describes principles and construction techniques for builders, householders and communities who are building in hazard-prone areas. The principles are clearly and simply presented- and in a form which can be adapted for use in training or public information campaigns - with an emphasis...
  6. Chickens have very basic needs: food and water, adequate shelter and space, and predator protection. Chicken owners go to all different lengths to meet those needs, from the simplest to the very elaborate. The beauty of raising chickens is that there is no set formula and no way that you must do...