Hi, The Elesta document can be downloaded from Dieter here: http://www.tube-tester.com/sites/nixie/dat_arch/EZ10A_EZ10B.pdf (not a good scan but the only one I found for download), the book by Konstantin Apel can be bought cheap on Ebay now and then and also at places like Abebooks for around $10-20 plus shipping, there are two editions, one from 1961 and one from 1967 that I know of, they are both interresting as they contain a few different circuit diagrams.
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