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Fascinating compilation of rules and laws relating to procedures in the British Parliament, as passed in the 17th and 18th centuries - as noted in the preface, "The Importance of this Book is so great, that whosoever peruses it, will find himself interested in it, as the Word Privilege is as Powerful as the Word Law..." ESTC lists only nine copies (and only three in the British Isles), which seems a rather small number for a British publication of this nature.