This book on soil physics is a great resource. To use it, start by skimming through the table of contents to find the topics you're interested in. Read the chapters carefully and take notes if needed. When handling the book, be gentle because of the staining and rubbing on the cover. To maintain it, store it in a dry place away from direct sunlight to prevent further foxing. Don't write in the book if you want to keep it in its current condition. Check the binding regularly to make sure it stays tight.