Set of 2 botanical plates Geigy, ophthalmia grass and rubella of the fields

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. Presence of four tiny dots probably related to the printing (light gray, orange) on the board of the ophthalmia grass, extremely discreet, are only visible when you are very close (see photos). Off-white background color (photos taken with a white background). Boards in the same color tones (ophthalmia grass, field rubella). Dimensions: 29.3 X 20.5 cm. Shipping in suitable rigid cardboard envelope. Do not hesitate to contact me for any questions.