On File "TM" is our award-winning collection of visual reference materials. Each On File "TM" depicts complex subjects in a way that both engages and informs students and researchers. These flexible resources fit into every curriculum. -- Instructors can use the pages for handouts, overheads, posters, and testing. -- Students can use them as quick sources of information, to reference curriculum topics, or to supplement their essays and reports. -- On Files "TM" are available in either binder or electronic format. -- All of the maps, charts, diagrams, and illustrations are designed in clean black-and-white graphics and are printed on sturdy pages. -- Pages are housed in durable three-ring binders. -- Replacement pages are available if they are lost or stolen.