AA ; ▁National ▁Marine ▁Fish eries ▁Service ▁– ▁End anger ed ▁Species ▁Act ▁The ▁IU CN ▁Red ▁List ▁of ▁Th re aten ed ▁Species ▁▁▁ 0 1 ▁North ▁America ▁▁ ▁North ▁America ▁Re pt iles <0x0A> </s> ▁Helen ▁R ex ▁K eller ▁( 1 8 7 7 – 1 9 6 7 ) ▁was ▁an ▁American ▁li br arian ▁and ▁author ▁of ▁reference ▁books . ▁Her ▁works ▁included ▁a ▁two ▁volume ▁dictionary ▁of ▁dates . ▁ ▁K eller ▁edited ▁and ▁wrote ▁the ▁pre face ▁for ▁the ▁Library ▁of ▁the ▁World ' s ▁Best ▁Liter ature , ▁a ▁ 3 0 - volume ▁reference ▁work ▁with ▁syn ops es ▁of ▁works ▁of ▁literature . ▁It ▁was ▁a ▁continu ation ▁and ▁expanded ▁version ▁of ▁the ▁Warner ▁Library ▁first ▁published ▁in ▁ 1 8 9 7 ▁with ▁various ▁ed itions ▁up ▁to ▁ 1 9 1 7 ▁edited ▁by ▁Charles ▁D ud ley ▁Warner . ▁She ▁also ▁author ed ▁a ▁Dictionary ▁of ▁D ates ▁divided ▁into ▁two ▁volumes ▁for ▁the ▁" old ▁world " ▁and ▁" new ▁world ", ▁and ▁also ▁author ed ▁the ▁Read ers ' s ▁Dig est ▁of ▁Books ▁which ▁provides ▁summar ies ▁of ▁about ▁ 1 , 5 0 0 ▁books . ▁ ▁K eller ▁taught ▁classes ▁in ▁library ▁economy ▁at ▁Columbia ▁University ▁and ▁was ▁the ▁li br arian ▁for ▁its ▁journal ism ▁school . ▁ ▁She ▁died ▁in ▁New ▁P alt z , ▁New ▁York , ▁in ▁ 1 9 6 7 . ▁ ▁Bibli ography ▁The ▁dictionary ▁of ▁dates ▁(