Excerpt: Citrus-fruit growers of California have been marketing their fruit cooperatively for over 30 years. The stability of the cooperative associations that form the California Fruit Growers Exchange and the success with which they have solved various complex marketing problems make a study of the federation of more than usual value. The organization and development of the exchange have been described in an earlier bulletin. This bulletin describes the operating methods of the local associations and discusses the factors which enter into the expense connected with the preparation of citrus fruit for market. Other marketing costs are treated briefly.