I left all my diving books in the states when I came down to Chile some years back since I figured that between my SSI, NAUI, PADI and AAUS cert's something should be good enough to let me dive. I thought wrong. In order to dive for my work, I need to get my certification accredited through the Chilean Navy. That means taking an advanced open water type exam and the next testing date is in two weeks. That gives me plenty of time to review for the exam, if I had any of the material here to review from. Since I don't and it'll be impossible to get any printed material here in time, I need to find something I can get off the net. Does anybody know of any free/creative commons/GPL type licensed book that I can download or where I an order downloadable books so I can prepare for this exam in time.