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Houghton Mifflin (HM) packages for grades 1-6 include a student text and teacher edition CD-ROM. The CD-ROM contains book pages for the teacher edition and student edition, assessment resources, a teacher resource book which contains reading skills and chapter concept worksheets, student resources which include worksheets for Investigate & Record, lesson review, writing in science, math skills, unit review, and review and test preparation. CD-ROM system requirements for Win/Mac: WindowsXP/ME/98SE with IE 5.5 or 6; Mac OS 8.6/9.2/OS X (OS 9-IE 5.0 or higher, for OS X IE 5.2.3 Netscape 7.1 or Safari); 64 MB RAM or 128 MB for XP or OS X.