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How to get Inkscape to save PDF's without ugly black boxes behind transparent raster images - Super User
Working inside the Black Box: Assessment for Learning in the Classroom - Paul Black, Christine Harrison, Clare Lee, Bethan Marshall, Dylan Wiliam, 2004
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![Inside the "Black Boxes": Introduction to Chemical Instrumentation. Edward J. Bair. McGraw-Hill, New York, 1962. viii + 349 pp. Illus. $10.75. | Science Inside the "Black Boxes": Introduction to Chemical Instrumentation. Edward J. Bair. McGraw-Hill, New York, 1962. viii + 349 pp. Illus. $10.75. | Science](https://www.science.org/cms/10.1126/science.136.3515.517.b/asset/a0cfe090-2a94-4176-ab2c-b0969ef1a59b/assets/science.136.3515.517.b.fp.png)