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By the U.S. Navy (1951). A supplement to Magnetic Amplifiers. The zealous authors of Magnetic Amplifiers appended this exhaustive 500-entry compendium, which lends itself to separate publication. Most of the citations are of patents you can still easily access. There are also citations of scientific and engineering journal articles, of military documents, and of procedings of the Institutes of Electrical, Electronics and Radio Engineers. Entries range all the way from the year 624 BC to 1951. A must for further research into the lost technology of the magnetic amplifier. Or you can just enjoy perusing these citations for a glimpse into a world of electronics now forgotten.