Websites
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A lengthy discussion of Yeats' relationship to Gregory suggests that it was way more complicated, and combative, than Yeats' poems suggest.
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This is a great web resource about the Great War.
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Yep, they definitely had planes (and cameras) during WWI.
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If you feel like taking a literary tour of Ireland, check this out.
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Yeats' page at the poet's graves website.
Video
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Check out a fantastic animation and narration of the poem.
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Here's another cinematic interpretation.
Audio
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This is just… awesome. The infamous Pogues frontman puts his own unique spin on the poem.
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This guy goes all out and really captures the tone of the poem.
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Check out this series of recordings of Yeats reading his own poems.
Images
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Here's a picture of the older Yeats, looking really serious.
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Here's the young W.B. Yeats.
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Here's a picture of the house at Coole Park, where Yeats and Robert Gregory spent much time.
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Check out a picture of Yeats' grave.
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Here's a picture of Lady Augusta Gregory, Robert Gregory's mother and friend of Yeats.
Articles and Interviews
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Yeats was also very involved in writing and producing plays. Here's an interview in Theatre Arts Monthly with him about that work.
Books
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Here are the collected poems of W.B. Yeats.
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Robert Gregory's plane has got to be in here somewhere.
Movies & TV
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Check out all the plays and poems that have been adapted to the big and small screen.