LEADER 00000cz 2200193n 4500 001 n 42024862 003 DLC 005 19910820141840.4 008 830527n| acaabaaa| |a ana ||| 010 n 42024862 040 DLC|cDLC|dDLC 130 0 ThinkAbout 410 20 Agency for Instructional Television.|tThinkAbout 430 0 Think about 643 Bloomington, Ind.|bAgency for Instructional Television 644 f|5DLC 645 t|5DLC 646 s|5DLC 670 Checking conclusions [MP] 1980.