On the occasion of the 100th anniversary of his birth, we commemorate Gyula Walleshausen, an outstanding and dedicated authority in the Hungarian librarianship and the first great generation of librarians after 1945, and in addition, one of the most important researchers in the history of Hungarian agricultural education, agricultural higher education and agricultural vocational training. In the course of his work as a librarian and historian, he respected, analysed with his competent knowledge and transformed the historical values of the past into volumes with scientific precision, thus preserving and handing them down to posterity. His writings on librarianship and university history are indispensable, important basic works for anyone researching a subject he studied or anyone who is simply interested in the history of a library issue, institution or discipline. In this article, we commemorate his entire career and his work, but above all his work as an agricultural historian.