It is the Archive listing of the Smithsonian holdings!!!
I love that sucker!!
That is how I found the titles of some of the WU Books and Items in my collection!!! 
The WU Teleprinter Maintainers Book that I got you a copy of and My Postal 
Telegraph Company teleprinters Books were all found with the aid of that index!!
I have some other WU titles that are not in the book too, along with some Local WU stuff
from Downtown and the Train Station here.
A lot of the Smithsonian collection are from the former WU museum and from former
WU Employees. 
A very cool nugget!! 

JD




On Tue, Jul 5, 2022 at 5:51 PM Nick England <navy.radio@gmail.com> wrote:
Just came across this FWIW. 500 page list of WU materials at the Smithsonian…

https://sirismm.si.edu/EADpdfs/NMAH.AC.0205.pdf


--
Nick England K4NYW
www.navy-radio.com
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