principal applicant principal applications principal architect principal areas principal arguments principal asked principal aspects principal author principal axis principal balance principal basis principal beneficiaries principal benefits principal body principal burr principal business principal called principal can principal carl principal categories principal causes principal cause principal cellist principal changes principal characteristics principal characters principal church principal cities principal city principal claim principal collins principal component principal concepts principal concern principal conclusions principal conductor principal consultant principal content principal contractor principal contribution principal countries principal criterion principal crops principal customers principal dancer principal debtor principal decisions principal demands principal designer principal difference principal directions principal director principal display principal elements principal enemy principal engineer principal exporters principal exports principal factors principal factor principal features principal feature principal figgins principal figures principal findings principal focus principal food principal force principal form principal function principal givens principal goal principal groups principal guidelines principal has principal hobson principal hooper principal incidents principal institutions principal instrument principal interest principal investigator principal investments principal investor principal issues principal job principal language principal leaders principal legal adviser principal lewis principal lines principal lowry principal machine principal madison principal markets principal market principal may principal means principal measures taken principal measures principal mechanism principal message principal metabolite principal method principal meyers principal mission principal monuments principal must principal name principal needs principal oak principal objectives principal objective principal object principal occupation principal of the school principal of this school principal offence principal office principal opponent principal organs principal owner principal parties principal partner principal part principal patron principal payments principal photography began principal photography principal pierce principal place of business principal place principal players principal points principal political principal port principal problems principal problem principal products principal provisions principal purpose principal raw materials principal reason principal recommendations principal reference principal regions principal representative principal requirements principal researcher principal research principal residence principal responsibility principal results principal reynolds principal rights principal risks principal rivers principal role principal rooms principal said principal saltzman principal scientist principal secretary principal sections principal sectors principal shareholder principal shepherd principal sites principal skinner principal snyder principal songwriter principal source of income principal source principal speaker principal sponsor principal stages principal stakeholders principal subject principal sum principal supplier principal sylvester principal tang principal target principal task principal taxpayer principal thing principal threats principal tool principal topics principal town principal turner principal types principal use principal value principal venue principal victims principal victoria principal wants principal weatherbee principal wilson