Text ( visual ) : unmediated Agricultural tools and field shapes : twenty five years of activity by the International Secretariat / Grith Lerche and Axel Steensberg. -- Copenhagen : National Museum of Denmark , 1980. -- 106 p. : ill., maps ; 23 cm. -- (Publications from the International Secretariat for Research on the History of Agricultural Implements ; no. 3). -- Bibliography: p. 101-[107]. -- ISBN 8748003093 ; (BB02876871) ; https://ci.nii.ac.jp/ncid/BB02876871 Author Heading(s): Lerche, Grith ; Steensberg, Axel. -- Classification(s): LCC : S671 ; DC19 : 631.3/09 s ; DC19 : 631.3/09. -- Subject Heading(s): LCSH : International Secretariat for Research on the History of Agricultural Implements -- History ; LCSH : Agricultural implements -- History ; LCSH : Tillage -- History

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