▁Ol m ec ▁culture ▁into ▁context . ▁This ▁first ▁exc av ation ▁was ▁fund ed ▁by ▁the ▁National ▁Geographic ▁Society ▁and ▁the ▁Smith son ian ▁Institution ▁and ▁focused ▁on ▁collect ing ▁samples ▁using ▁strat ip its . ▁ ▁In ▁ 1 9 5 5 , ▁Dru cker ▁led ▁a ▁new ▁exc av ation , ▁fund ed ▁again ▁by ▁the ▁National ▁Geographic ▁Society , ▁concentr ating ▁on ▁Complex ▁A ▁and ▁finally ▁reaching ▁the ▁sub so il ▁at ▁the ▁site , ▁established ▁strat ig raph y ▁to ▁discover ▁the ▁construction al ▁history . ▁They ▁discovered ▁more ▁j ade ▁artifact s , ▁which ▁were ▁interpreted ▁as ▁rit ual ▁offer ings , ▁as ▁well ▁as ▁pot tery ▁sh ards . ▁The ▁find ings ▁were ▁published ▁by ▁Dru cker , ▁Robert ▁He izer ▁and ▁Robert ▁S quier , ▁( who ▁were ▁also ▁assist ed ▁by ▁Edu ardo ▁Con tr eras ▁and ▁Pierre ▁Agr in ier ) ▁in ▁ 1 9 5 9 . ▁At ▁this ▁point ▁most ▁of ▁the ▁site ▁was ▁still ▁un ex c av ated ▁and ▁in ▁a ▁strongly ▁word ed ▁passage ▁He izer ▁reported ▁that ▁the ▁site ▁was ▁in ade qu ately ▁protected ▁by ▁the ▁Mexican ▁government ▁and ▁a ▁wave ▁of ▁illegal ▁exc av ations ▁followed ▁the ▁departure ▁of ▁the ▁arch ae olog ists , ▁as ▁well ▁as ▁damage ▁by ▁urban ▁spraw l , ▁the ▁national ▁oil ▁company , ▁P em ex , ▁and ▁the ▁removal ▁of ▁large ▁monuments ▁to ▁museum s ▁( without ▁leaving ▁markers ▁as ▁to ▁their ▁original ▁positions ). ▁ ▁Several ▁subsequent