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University of Northern Iowa: Blank Verse
Very clear and detailed explanation of blank verse, including related terms such as iambic pentameter and other forms of meter in poetry. Also includes a "How to and Examples," section that discusses the difficulties of writing in blank...
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Bob's Byway: Glossary of Poetic Terms
Calling itself "unique," Bob's is easy to use, with cross-links throughout, phonetic pronunciation guides when necessary, and many examples and quotations. Click on the letter and scroll for the word.