* PHD: Graduate School Enrollment vs. Unemployment Rate (graduate enrollment in engineering).
* A history of offshore drilling. Excellent white paper on the history of the offshore business.
* The cost of new oil supply. The chart for the cost/well is amazing.
* Liberating America's Secret Laws. Overly dramatic title, but interesting subject, because things like ASME's Boiler Code are a part of the law, but not actually accessible to common citizens.
* Ignition! The history of the development of rocket fuel.