Bill Holly's (K1BH) book "The Vibroplex Co., Inc." used to be sold by Vibroplex but is now out of print.

However, Tom French's book, "Vibroplex Collectors Guide" is available at no charge on the Vibroplex website. 

http://www.vibroplex.com/techdocs/Vibroplex_Collectors_Guide.pdf 36MB file size. 

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David N1EA