1. It was a common practice even on friendship trains, as customs officers were reluctant to search trains decorated with red stars (Sowinski 2005, 166).
2. “Incorrect behaviour of Polish tourists in western Ukraine,” June 10, 1981, TsDAHO.
3. TsDAHO, f.1, op.24, s.4575, ark. 4–6.
4. “Information on customs control in April 1978,” May 1978, AAN, z.1354, s.XL, t.217.