Hilversunm, Verloren, 1987, 320 blz. Fig., tabellen & ills. Ing. softcover (Middeleeuwse studies en bronnen VI). with a dedication by the author to Prof. G.P. van de Ven. From the library of Prof. Dr. G.P. van de Ven. Gerard van de Ven (1941-2017) was a prominent Dutch scholar, author and professor at the Universiteit van Amsterdam. He was specialised in waterstaatsgeschiedenis (history of water management) and historical geography. He wrote many books, articles and contributed to many publications.