▁and ▁its ▁sister ▁publications ▁under ▁Gro lier — The ▁Book ▁of ▁Know ledge , ▁the ▁Book ▁of ▁Popular ▁Science , ▁and ▁Land s ▁and ▁Pe op les — w ere ▁strong ▁enough ▁to ▁support ▁the ▁company ' s ▁occup ancy ▁of ▁a ▁large ▁building ▁( vari ously ▁named ▁the ▁Amer icana ▁Building ▁and ▁the ▁Gro lier ▁Building ) ▁in ▁Mid town ▁Manh attan , ▁at ▁ 5 7 5 ▁Lex ington ▁Avenue . ▁Sales ▁during ▁this ▁period ▁were ▁accomplished ▁primarily ▁through ▁mail - order ▁and ▁door - to - door ▁operations . ▁Te lem ark eting ▁and ▁third - party ▁distribution ▁through ▁their ▁Lex icon ▁division ▁added ▁to ▁sales ▁volumes ▁in ▁the ▁ 1 9 7 0 s . ▁By ▁the ▁late ▁ 1 9 7 0 s , ▁Gro lier ▁had ▁moved ▁its ▁operations ▁to ▁Dan bury , ▁Connecticut . ▁ ▁Later ▁develop ments ▁ ▁In ▁ 1 9 8 8 ▁Gro lier ▁was ▁purchased ▁by ▁the ▁French ▁media ▁company ▁H ach ette , ▁which ▁owned ▁a ▁well - known ▁French - language ▁en cyc lopedia , ▁the ▁H ach ette ▁Encyclopedia . ▁H ach ette ▁was ▁later ▁absor bed ▁by ▁the ▁French ▁con gl omer ate ▁the ▁Lag ard ère ▁Group . ▁ ▁A ▁CD - ROM ▁version ▁of ▁the ▁en cyc lopedia ▁was ▁published ▁in ▁ 1 9 9 5 . ▁Although ▁the ▁text ▁and ▁images ▁were ▁stored ▁on ▁separate ▁dis ks , ▁it ▁was ▁in ▁keeping ▁with ▁standards ▁current ▁at ▁the ▁time . ▁More ▁important ly , ▁the ▁work