Set of 2 botanical plates Geigy, lamb's lettuce and mirror of Venus

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. Three tiny black dots on the tuce board. On the board of the mirror of venus, two tiny orange dots on the board and another on the lower frame on the left. Everything is extremely discreet, you really have to be very close to see it (see photos). Off-white background color (photos taken with a white background). Boards in the same color tones (lamb's lettuce, mirror of venus). Dimensions: 29.3 X 20.5 cm. Shipping in suitable rigid cardboard envelope. Do not hesitate to contact me for any questions.