Identification title(s): rectangle and a triangle. Object type: sketchbook sheet object number: rp-t-1994-155-b. Inscriptions / marks: annotation, handwritten in pencil, purple colored pencil and black pen: '[. . ]', mathematical notes and addresses. Description: back cover of a sketchbook with 72 leaves. Manufacture. Manufacturer: draftsman: reijer stolk. Date: ca. 1916. Physical characteristics: pencil, purple colored pencil and black pen. Material: paper pencil ink technique: pen. Topic: what: mathematics. Credit line: donation from mr p. Stolk, the hague. Acquisition: donation 1994. Date: circa 1916.
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