Note sure if this has been referenced before. 'Fairing Well' - NASA truck testing for reduced drag, mostly in the 1960s and 1970s. Published by NASA, and well researched with interviews, plenty of citations, etc.
I bought a low cost paper copy (a nicely bound hardback from Amazon) but it's also available as a free pdf download
here.
In today's terms, there's nothing truly startling in what they did or what they found, but it's all still pretty interesting. I liked for example trialling a flat plate addition (with a known Cd) to a vehicle to see if total drag then rose to the calculated value as it should. Use of pumped fine dust (see below) was also good. Also plenty on the value of full-size testing versus wind tunnel and CFD.
An unexpected slant is the author's sociological excursions - technological determinism versus sociological determinism in the adoption of new technologies.
There are a lot of footnotes to interesting aero references, and some good patents included as appendices.
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