Annals of the American Academy of Political and Social Science, Volumes 117-119

acreage acres agricultural American amount average bituminous coal bushels capital census cent cerned charges co-operation co-operative coal Commission companies consumers cost cotton crop curves demand distribution dollars duction economic electric employes engineering estimated expense export fact farm products farmers Federal figures firms fuel Giant Power grain horsepower hydro-electric important improved income increase industry interest labor land length of service less lignite lines load factor loss manufacturing margins material ment methods milk million months nomic North Dakota occupations operation organization pany Pennsylvania period Philadelphia plant ployes population Portland Cement possible practice problem profits Proportion of Separations public ownership purchasing reasons result rural semi-skilled skilled steam sumers supply TABLE tariff tion trade tural turnover turnover rates United unskilled utilities wages water power wheat workers