Looking for an ARC R&M seaplane report, but it's not on AERADE. Suggestions?

[AeroFranz]

I am looking for an ARC technical report on seaplane stubs (a.k.a. sponsons), but my usual go-to place for all British reports, AERADE, doesn't have it. Do you know of other online resources where it might be found? I'm starting to think i should go to my local library and request it from someplace that has a physical copy.

Here's the info on the report:
Coombes, L. P. and D. W. Bottle. Notes on Stubs for Seaplanes. London, H. M. Stationery Off., Sep 1935. 32 p. (Gt. Brit. Aeronautical Research Council. Rpt. and Memo. 1755)

thanks!