File:Line 4 Budapest Metro.JPG - Wikimedia Commons
File:Metro 4, M4, Line 4 (Budapest Metro), Kálvin tér.jpg - Wikimedia Commons
Metro 4: Coming Soon to a Stop Near You > McDaniel College BudapestMcDaniel College Budapest
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metro 4 Budapest - Budapest 101
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759 Budapest Metro Stock Photos - Free & Royalty-Free Stock Photos from Dreamstime
Ride with me the brand-new Metro 4 in Budapest – %%sitename%%
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EPB Shields for Building Metro Line 4 in Budapest/H - tunnel
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Csapó Balázs of PALATIUM talks about designing Budapest's Metro 4 line stations, their hardest project to date - SHARE Architects
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Budapest opens controversial Metro Line 4
