In case anyone wants it, google books has H. B. Brook's 1931 paper called "Design of Standards of Inductance, and the Proposed Use of Model Reactors in the Design of Air-Core and Iron-Core Reactors."
It's research paper 342 (RP342) and found starting on page
338 of a PDF that google books allows anyone to download; from the Bureau of Standards Journal of Research, volume 7, July to December, 1931, Research Papers Nos. 329 to 395.To find the PDF, use google search and enter:
RP342 brooks inductance
into the engine. The first entry is the right one. From there, you can get the PDF file and find the article.
Just for anyone interested in following up on the earlier discussion about inductors made from the least amount of wire relative to the inductance achieved.
Jon