▁a ▁month ly ▁magazine ▁in ▁paper back ▁format , ▁with ▁a ▁single ▁novel ▁and ▁a ▁short ▁editor ial ▁feature ▁in ▁each ▁issue , ▁plus ▁an ▁occas ional ▁short ▁story . ▁The ▁e ighth ▁issue ▁was ▁the ▁last ▁on ▁the ▁fort night ly ▁schedule . ▁Iss ues ▁ 9 – 1 2 ▁were ▁titled ▁" S cience ▁F iction ▁Month ly " ▁in ▁the ▁footer ▁of ▁the ▁cover . ▁In ▁mid - 1 9 5 1 , ▁Land s borough ▁left ▁Hamilton , ▁and ▁Campbell ▁replaced ▁him ▁as ▁editor ▁of ▁Auth entic ▁with ▁the ▁th ir teenth ▁issue , ▁which ▁was ▁also ▁the ▁first ▁one ▁on ▁which ▁the ▁title ▁changed ▁to ▁" Auth entic ▁Science ▁F iction ". ▁ ▁Under ▁Campbell ▁Auth entic ▁improved ▁somewhat , ▁and ▁continued ▁its ▁met am orph osis ▁into ▁a ▁magazine , ▁with ▁additional ▁non - f iction ▁writing , ▁and ▁short ▁fiction ▁in ▁addition ▁to ▁the ▁main ▁novel ▁in ▁each ▁issue . ▁Hamilton ▁also ▁ran ▁a ▁science ▁fiction ▁paper back ▁im print , ▁Pan ther ▁Books , ▁which ▁would ▁go ▁on ▁to ▁become ▁one ▁of ▁the ▁leading ▁British ▁sf ▁houses . ▁By ▁ 1 9 5 3 ▁the ▁British ▁sf ▁market ▁was ▁going ▁through ▁a ▁met am orph osis ▁similar ▁to ▁the ▁one ▁going ▁in ▁the ▁US ▁at ▁the ▁same ▁time : ▁poor ▁quality ▁sf ▁mark ets ▁were ▁failing , ▁and ▁the ▁result ▁was ▁a ▁reduced ▁but ▁active ▁market , ▁with ▁four ▁mag az ines : ▁Auth entic , ▁New ▁World s , ▁Science ▁Fant asy , ▁and