▁CD - ROM ▁database ▁consisting ▁of ▁an ▁index ▁of ▁head lines ▁and ▁sub - head lines ▁from ▁the ▁years ▁ 1 9 4 5 – 1 9 9 9 . ▁A ▁much ▁more ▁expensive ▁full - text ▁search able ▁database ▁is ▁available ▁only ▁at ▁the ▁Harvard - Y en ch ing ▁Library ▁at ▁Harvard ▁University , ▁which ▁not ably ▁includes ▁advert is ements ▁in ▁its ▁index . ▁Research ers ▁using ▁other ▁university ▁libraries ▁would ▁probably ▁have ▁to ▁first ▁use ▁the ▁CD - ROM ▁index , ▁and ▁then ▁look ▁into ▁the ▁micro film ▁or ▁sh uk us ats ub an ▁versions . ▁Micro film ▁versions ▁are ▁available ▁from ▁ 1 8 8 8 ; ▁sh uk us ats ub an ▁versions ▁are ▁available ▁from ▁ 1 9 3 1 . ▁Iss ues ▁of ▁the ▁As ah i ▁sh in b un ▁printed ▁since ▁August ▁ 1 9 8 4 ▁are ▁available ▁through ▁Lex is - N ex is ▁Academ ic . ▁ ▁Main ichi ▁sh in b un ▁Micro film ▁versions ▁of ▁the ▁Main ichi ▁sh in b un ▁are ▁available ▁for ▁the ▁years ▁ 1 9 8 4 – 2 0 0 5 , ▁and ▁sh uk us ats ub an ▁are ▁available ▁from ▁ 1 9 5 0 ▁to ▁ 1 9 8 3 . ▁Iss ues ▁of ▁the ▁Main ichi ▁sh in b un ▁printed ▁since ▁March ▁ 2 7 , ▁ 1 9 9 8 , ▁are ▁available ▁through ▁Fact iva . ▁ ▁St ance ▁and ▁circul ation , ▁only