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In addition , the Inventing America StudySpace site allows students to practice their research skills through directed Research Projects , which include reproductions of primary source documents , newspaper articles , and journal entries , as well as archival images , audio passages , and video files for each chapter . Throughout , maps , primary source documents , and features that explain essential economic principles enhance the learning process . When combined with our presentation software or overhead transparencies , your students will actively engage with your lecture materials and leave the classroom with an indispensable study aid . Covered bonds are securities backed by mortgages or public sector loans , which the issuer can retain on its balance sheet . Paton has 3 probowl players , including his quaterback in Brees . The money is divided among support for bioterrorism defense , firefighters and law enforcement agents , beefed-up airport and border security and improved intelligence collection .