▁Collins ' s ▁religion ▁im print . ▁ ▁Collins ▁ultimately ▁became ▁a ▁diverse ▁and ▁pro l ific ▁company , ▁publishing ▁a ▁wide ▁range ▁of ▁titles , ▁including ▁many ▁aim ed ▁at ▁a ▁ju ven ile ▁audience , ▁such ▁as ▁the ▁books ▁of ▁Dr . ▁Se uss ▁( in ▁the ▁Commonwealth ) ▁and ▁Race y ▁Hel ps ▁in ▁the ▁ 1 9 5 0 s . ▁By ▁the ▁late ▁ 1 9 7 0 s , ▁Collins ▁was ▁also ▁responsible ▁for ▁publishing ▁the ▁long - running ▁American ▁Children ' s ▁Hard y ▁Boys ▁and ▁Nancy ▁D rew ▁series ▁in ▁the ▁United ▁Kingdom . ▁These ▁were ▁first ly ▁published ▁in ▁a ▁series ▁of ▁dig est ▁size ▁hard back s ▁a kin ▁to ▁their ▁American ▁style . ▁P aper back s ▁( of ▁a ▁' normal ' ▁rather ▁than ▁' dig est ' ▁size ) ▁soon ▁followed ▁from ▁Collins ' ▁Arm ada ▁Books ▁im print , ▁although ▁the ▁series ▁as ▁published ▁in ▁England ▁follow ▁a ▁different ▁number ing ▁system ▁to ▁the ▁accepted ▁American ▁one . ▁Collins ' s ▁Arm ada ▁Books ▁im print ▁also ▁published ▁similar ▁series , ▁such ▁as ▁the ▁Three ▁Investig ators , ▁alongside ▁such ▁British ▁stal w arts ▁as ▁Big g les , ▁Billy ▁B unter , ▁and ▁P adding ton ▁Bear , ▁and ▁such ▁well - lo ved ▁authors ▁as ▁En id ▁B ly ton , ▁Mal col m ▁Sav ille ▁and ▁D iana ▁P ulle in - Th om pson . ▁ ▁In ▁ 1 9 5 3 ▁Collins ▁launched ▁its