Libraries are changing quickly to meet the demands of an online age, but one welcome development at Denver's Central Library is oddly retro. DPL now allows patrons to check out items from its vast repository of government documents, so that the determined researcher can take home such pre-Internet jewels as Know Your 8-Inch Howitzer and Identifying Sheep Killed by Bears. Of course, the collection also includes considerable information on public lands, congressional hearings and reports on current topics, reliable health information and much, much more.