Last week I visited Greece among a group visiting and studying the sites related to the Bible. Before the trip I had read Verhoef: Philippi: "How Christianity Began in Europe: The Epistle to the Philippians and the Excavations at Philippi", and it was very useful
https://www.logos.com/product/52220/philippi-how-christianity-began-in-europe-the-epistle-to-the-philippians-and-the-excavations-at-philippi
The Internet does not work very well there and could be quite expensive. Therefore the user should download the book to the tablet before the trip.
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