I am not sure is this original sheet from 1938. or some kind of reprint? It doesn't look to be so old... but, on the other side, there is no any "reprint" or "facsimile" mark anywhere. Signatures looks to be original (not printed), but I don't have idea who are those people... tried to Google them, but without useful results. Reverse of the sheet is blank.

I have found the same example used on the cover in 1938... showed in the NJPH society journal (vol. 21 number 5)... available on-line in the PDF format.