There was only one copy of the precious "Doeff Halma" even in Tekijuku (the school of the Western studies) led by Koan OGATA, which had a reputation as the best Institute for Dutch Studies in those days, and the dictionary was especially kept in a separate room of about three mats called 'Doeff room.'
貴重な『ヅーフ・ハルマ』は当時最高の蘭塾と評判の高かった緒方洪庵の適塾にも一部しか無く、わざわざ「ヅーフ部屋」と呼ばれる3畳程の別室に保管された。