Aalten, De Graafschap 1958 127pp. + errata en 2pp. stellingen, met 15 kaarten en enkele figuren in tekst, 25cm., Doctoraal proefschrift (Rijksuniversiteit te Utrecht), originele omslag, stempeltje op verso titelblad, [With a summary in English: The influence of the landscape on military operations during the Second World War], G111922
Leiden, 1989 129 + 68pp., with illustrations, 28cm., text in English, Doctoral Dissertation (Rijksuniversiteit te Leiden, the Netherlands), softcover, stamp at verso of title page, text is clean and bright, S113173