{$mEDiAurl} whAt is thE tAlk mAinly ABout
AmEriCAn FArm liFE in thE EArly twEntiEth CEntury
B．thE history oF A suCCEssFul BusinEss innovAtion
C．DiFFErEnCEs BEtwEEn thE rurAl AnD urBAn wAy oF liFE
D、thE EFFECts oF mAil-orDEr CAtAlogs on rurAlAmEriCA