Users can also save Excel workbooks as XML spreadsheets. NodeXL workbooks contain four worksheets&colon; Edges, Vertices, Groups, and Overall Metrics. This edition includes a supplemental CD-ROM that has workbooks, quizzes, lesson transcripts, and exams. The course includes workbooks, textbooks, and a 52-episode television series. In addition to activities, MyNoggin included printable workbooks that expanded upon math and science concepts. The publishing company also created workbooks, literacy centers, and picture books for younger grades. More recently, electronic workbooks have permitted interactive and customized learning. The first episode refers to these as one textbook, two workbooks and audiocassettes. Specialists also use activities, games, and printable workbooks to help students practice what they learn. Solutions to problems in dot maps can be found in many 7th-grade math workbooks. Kay teaches inductive Bible study, and has authored many inductive Bible study workbooks. Supplemental items range from CD-ROMs and workbooks to online passcodes and bonus material. Merit badge workbooks are used by counselors, summer camps, and merit badge colleges. Some systems extend this syntax to allow cell references to different workbooks. Self-guided workbooks tailored for younger children are available for some of the museum exhibits.