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![Barnard's Universal Cipher Code [microform]: for Telegraphic Communication Between Chiefs of Police, Sheriffs, Marshals and Other Peace Officers of th](https://images.cdn3.buscalibre.com/fit-in/180x180/e9/3c/e93c79fc0d3d7ffd91a791b8aaebd87d.jpg)







![Threshold Signals, Edited by James L. Lawson [and] George E. Uhlenbeck [under the Supervision of the] Office of Scientific Research and Development, N](https://images.cdn1.buscalibre.com/fit-in/180x180/9a/58/9a58c578f3c060919d29775e709f3eda.jpg)






![Broadcasting in the Public Interest [microform]](https://images.cdn3.buscalibre.com/fit-in/180x180/fa/29/fa29b40d6484db564910cbd5dbbe447f.jpg)


















