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aavr American Library Association American Newspaper Annual architectural drawings associated features automobile instruction manuals average circulation figures calculated circulation per issue classes coefficient of distribution column combined data component lists comprehension current reading matter daily and Sunday described for magazines determination electric circuit diagrams estimated formal instruction frequency index frequency of occurrence given form graphic forms employed graphic forms found included index for combined issues of magazines juvenile magazines key strip LINE GRAPH list of graphic list of magazines low in frequency magazines read magazines surveyed master list mechanical drawing method newspapers and automobile non-specialist number of issues periodical literature phantom drawings Philadelphia radio rank index rank indices Rate and Data reader reading interests select magazines specialists sub-list four sub-list six subordinate features Tables of Data tabulation sheet tally technical magazines TION total annual circulation total number types of graphic units of subject women's magazines World Almanac zines