Pamphlets on Conservation of Natural Resources, 5. sējums

acre Address agricultural American annual Applause Association average believe better cent Chairman child church City Kansas City clubs coal commission conservation movement coöperative corn cost crop cultivation delegates disease dollars efficiency Executive Committee fact farm farmers Federal fire waste forest forestry Gifford Pinchot Government human important improved increase industry interest Kansas City Kansas labor land laws legumes live loss Louisiana ment methods million Missouri movement National Conservation Congress natural resources nitrogen Olathe organization Pennsylvania phosphate phosphoric acid phosphorus plant plowing population postal savings system practical present President problem profit proper protection railroads railways represent Richard Lieber roads rural Secretary seed-bed society soil fertility supply things timber tion transportation tuberculosis typhoid fever United vital water power wheat women yield York