Tentoonstelling 80 jaar Van Gelder Papier Velsen / [tekst: P. Vons]The identification of heavily corroded roman coins found at Velsen : an attempt at a closer dating of the early roman settlement "Velsen I" / by P. VonsMetamorphosed Roman denarii from Velsen (N.H.) / P. Vons ; with contributions by M.D. De Weerd and E.H.P. CordfunkeRomeinse gemmen uit Velsen / P. VonsRoman lead sealings from Velsen (N.H.) / [by] P. Vons