If you Google exactly: "120 Hymns for Brass Band" Andrew Duncan PDF — the top organic result will likely be the World of Brass purchase page (approx £25-£30). The top free result is often a user upload on a document-sharing site, but that file is usually missing parts (only Bb treble clef, no bass/eb parts).
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Save your 120 arrangements as a single merged PDF for tablets. If you Google exactly: "120 Hymns for Brass