Lajtha’s letters
(bequest owned by House of Heritage, Martin Médiatár)
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Letters from the front line to his fiancée 1914-1918
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Letters to the family 1921-1962
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Correspondence with his editor, Alphonse (later Claude and Gilbert) Leduc
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Letters to Henry Barraud
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Letters to Mrs Elisabeth Sprague-Coolidge
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Letters to his son Ábel and his grandson Christopher
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Letters to Lali Papp
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Letters to Esteban Fekete
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Letters to Gábor Radnai
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Letters to János Weissmann
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Letters to the Kazatsay family
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Romain Rolland”s letters of thanks to Lajtha
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Letters to Gyula Ortutay