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The first edition of 1843 was in 3 volumes, as stated on the title page, and had "520 wood-engravings" (I haven't counted them to check). Later editions were variously in 2, 3, 4, or 6 volumes, complicated by supplements (which sometimes formed a 3rd or 4th volume). Chiswick Chap (talk) 11:08, 23 January 2013 (UTC)[reply]