▁often ▁finding ▁himself ▁forced ▁to ▁write ▁material ▁under ▁pseud onym s ▁to ▁fill ▁an ▁issue . ▁ ▁In ▁early ▁ 1 9 5 7 , ▁T ub b ▁persu aded ▁Hamilton ▁to ▁switch ▁the ▁magazine ▁from ▁pocket - book ▁to ▁dig est ▁size ▁format , ▁in ▁the ▁hope ▁that ▁this ▁would ▁improve ▁the ▁magazine ' s ▁visibility ▁on ▁book st alls . ▁The ▁circul ation ▁did ▁indeed ▁rise , ▁to ▁about ▁ 1 4 , 0 0 0 ▁copies ▁per ▁month — a ▁surprising ly ▁low ▁figure ▁given ▁Land s borough ' s ▁assertion ▁that ▁Auth entic ▁had ▁been ▁s elling ▁ 3 0 , 0 0 0 ▁copies ▁in ▁the ▁early ▁days . ▁However , ▁later ▁that ▁year , ▁Hamilton ▁made ▁the ▁decision ▁to ▁invest ▁a ▁substantial ▁sum ▁in ▁the ▁UK ▁paper back ▁rights ▁of ▁an ▁American ▁best - s eller : ▁it ▁is ▁not ▁known ▁for ▁certain ▁which ▁book ▁this ▁was , ▁but ▁it ▁is ▁thought ▁to ▁have ▁been ▁E van ▁Hunter ' s ▁The ▁Black board ▁Jung le . ▁Hamilton ▁could ▁no ▁longer ▁afford ▁to ▁have ▁c ash ▁tied ▁up ▁in ▁Auth entic , ▁and ▁in ▁the ▁summer ▁of ▁ 1 9 5 7 ▁T ub b ▁was ▁given ▁two ▁months ▁to ▁close ▁down ▁the ▁magazine , ▁printing ▁stories ▁that ▁had ▁already ▁been ▁paid ▁for . ▁The ▁last ▁issue ▁was ▁dated ▁October ▁ 1 9 5 7 . ▁ ▁Cont ents ▁and ▁reception ▁ ▁For ▁the ▁first ▁twenty - five ▁issues , ▁Auth entic ▁ran ▁a ▁full ▁novel ▁in ▁every