Set of 2 botanical plates Chenopod and Amaranth

Botanical plates from geigy weed tables. These are boards with weeds for a manufacturer of phytosanitary products. Copyright of the 1970s. Very fine and detailed drawing. Very good general condition. Off-white background color (photos taken with a white background). Plates 20.2 and 23.1 (white goosefoot and reflected amaranth) in the same color tones. Straight edges very slightly yellowed for the goosefoot (but it is especially on the back of the board, see photos) dimensions: 29, 3 X 20.5 cm. Postal shipping in followed letter or mondial relay in a suitable rigid cardboard envelope. Do not hesitate to contact me for any questions.