A man who has spent his life in the field, and cause, of conservation writes now of what should be done to forestall waste and exhaustion of what was originally a rich, natural heritage. Partisan politics, departmental friction and inefficiency, public and private indifference have already been responsible for too much damage and depletion. Lieber covers a wide field -- minerals -- where we have ""lived on principal"", water, forests, land. He shows how the work just begun by the CCC must be continued -- expanded. A good survey of the problems and musts in a field of importance to all.